We cover four proven stocking combinations, the right equipment, and the maintenance routine that keeps all of them stable.
Why the 29-Gallon Tank Is a Major Step Up
The 29-gallon shares shares the same 30-inch footprint as the 20-gallon long, but stands 18 inches tall instead of 16. That two-inch difference unlocks species that require vertical swimming space and taller plants for cover.
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It is the smallest tank suitable suitable for a single angelfish pair. Angelfish reach 6 inches tall at maturity and need that 18-inch depth to move naturally.
No smaller tank provides that, which is why this size has a dedicated following among community keepers stepping up from a smaller alternative.
The added water volume also gives you a larger buffer against parameter swings. A missed water change in a 5-gallon tank tank can spike ammonia within 24 hours.
In 29 gallons you, you have more time, more bacterial colony stability, and more room to correct mistakes before they become losses.
Tall stem plants, amazon swords, and vallisneria all perform better here and give mid-water and upper-level fish the cover they need to behave naturally.
Before choosing a combination, identify the species you most want and build around their requirements. Every combo below starts with a centerpiece or schooling species and layers compatible tank mates mates around it.
Mixing elements from different combos is the most common mistake at this tank size size. Pick one and stock it completely before considering additions.
29-Gallon Tank Stocking: 4 Combinations That Work
Each combination below has been selected for parameter compatibility, zone separation, and bioload that fits within 29 gallons without pushing filtration to its limit. All four use species with strong track records in community setups.
| Combo | Species | Count | Difficulty | Water Temp / pH |
|---|---|---|---|---|
| Angelfish Community | Angelfish + rummy-nose tetras + sterbai corys | 2 + 8 + 6 | Intermediate | 78-82°F / 6.5-7.0 |
| Planted Community | Neon tetras + harlequin rasboras + corydoras + pearl gourami | 10 + 8 + 6 + 1 | Intermediate | 76-80°F / 6.5-7.2 |
| Barb Tank | Cherry barbs + corydoras + bristlenose pleco | 10 + 6 + 1 | Beginner-Intermediate | 73-79°F / 6.5-7.5 |
| Livebearer Mix | Platies + mollies + bristlenose pleco | 6 + 6 + 1 | Beginner | 72-82°F / 7.0-8.0 |
Combo 1: Angelfish Community
Two angelfish at minimum tank size occupy the upper and mid swimming zones. Pair them with eight rummy-nose tetras for a tight, visible school in the mid-water column and six sterbai corydoras on the substrate for a complete, layered display.
Rummy-nose tetras are the preferred tetra pairing for angelfish because their compact, fast-moving school behavior makes them look like they belong together, and their movement speed keeps them clear of angelfish territory claims.
- Angelfish pair: select two juveniles from the same batch and let them pair naturally. Forced pairing of adults rarely holds in community tanks.
- Rummy-nose tetras: eight is the minimum for a visible, tight school. Ten is better. Their red heads fade under stress, making them a useful parameter indicator.
- Sterbai corydoras: one of the few corydoras that tolerate the warmer temperatures angelfish require. Most corydoras species prefer 72-76°F, which conflicts with angelfish at 78-82°F.
Do not add aggressive or fin-nipping species to an angelfish tank. Bottom layer cleanup fish are essential here because the bioload from a growing angelfish pair is significant.
Combo 2: Planted Community
This combination maximizes species diversity while keeping bioload manageable. Ten neon tetras school in the mid-water column, eight harlequin rasboras occupy the upper-mid zone, six corydoras work the substrate, and one pearl gourami serves as the single centerpiece fish.
Pearl gouramis are one of the best centerpiece choices for planted 29-gallon tanks. They are peaceful, reach 4-5 inches, have minimal aggression toward tank mates, and thrive in heavily planted environments where they graze biofilm from plant surfaces.
- Zone separation: neon tetras hold mid-water, harlequin rasboras move in the upper-mid zone, pearl gourami occupies the surface-to-upper zone, corydoras stay on the substrate. No competition for space.
- Parameter overlap: all four species share the pH 6.5-7.2 and temperature 76-80°F range without compromise.
- Plant density: this combo benefits most from dense planting. Amazon swords, java fern, and vallisneria in the background with open mid-tank swimming space gives every species what it needs.
This is not the easiest combo on the list. Neon tetras are sensitive to ammonia spikes, and ten of them plus the full bioload of the other species require consistent filtration and regular water changes to stay stable.
Our neon tetra care guide covers the water parameters and acclimation steps that make the difference between a stable school and a tank that crashes in the first month.
Combo 3: Barb Tank
Ten mid-level school cherry barbs occupy the mid-water column with restless, active movement that makes a 29-gallon look constantly alive. Add six corydoras on the substrate and one bristlenose pleco for algae control, and the tank is fully stocked without being overcrowded.
Cherry barbs are one of the most underrated schooling fish in the hobby. Unlike tiger barbs, they are not fin-nippers.
Unlike neon tetras, they tolerate a wide range of water conditions. A school of ten creates constant movement through mid-water in a way that smaller groups simply do not achieve.
If you prefer a softer-water mid-level schooler for this combo, our harlequin rasbora guide covers a species that fits the same zone with a smaller bioload per fish.
- Sex ratio: keep a 1:1 or 1:2 male-to-female ratio. Males color up to a deep red when competing for female attention, which creates natural display behavior.
- Bristlenose pleco: stays under 5 inches, eats algae and biofilm, produces moderate waste but far less than a common pleco. Keep only one per tank.
- Substrate: sand or fine gravel for corydoras. Coarse substrate damages the sensitive barbels corydoras use to forage.
Combo 4: Livebearer Mix
Six platies and six mollies create a naturally active, color-varied community that tolerates harder, more alkaline water than any other combo on this list. Add one bristlenose pleco for algae control and the tank is stable at a beginner-accessible maintenance level.
This is the right choice if your tap water runs hard and alkaline. Rather than fighting your water chemistry to meet the demands of soft-water species, build around species that thrive in what you already have.
- Control breeding: both platies and mollies breed readily. Keep all males or use a 2:1 female-to-male ratio and remove fry, or the tank overstocks itself within 2-3 months.
- Molly varieties: sailfin mollies reach 4-5 inches, which is a tight fit. Short-finned mollies at 2-3 inches are a better choice in 29 gallons.
- Avoid mixing with tetras: the water chemistry requirements do not overlap cleanly. Build a livebearer tank as a livebearer tank, not a mixed-parameter compromise.
Equipment for a 29-Gallon Community Tank
The 29-gallon's water volume gives you more margin than smaller tanks, but it also means filter and heater sizing matters more. Undersized equipment is the most common setup mistake at this tank size.
| Equipment | Specification | Notes |
|---|---|---|
| Filter | Canister or HOB, 150+ GPH | Target 5-6x tank volume per hour turnover. Canister filters give more media capacity for higher-bioload combos like the angelfish community. |
| Heater | 100W adjustable | Use a separate thermometer on the opposite side of the tank to verify even heat distribution. Heater failure is the leading cause of unexplained fish loss. |
| Lighting | Full-spectrum LED, 6500K | Planted spectrum essential if running live plants. Match the photoperiod to 8-10 hours to prevent algae outbreaks. |
| Substrate | Fine sand or planted substrate | Sand is required if any corydoras combination is selected. Planted substrate supports root feeders like amazon sword. |
| CO2 | Optional | Not required, but significantly improves stem plant and sword growth in the planted community combo. |
A canister filter is the preferred choice for the angelfish community and planted community combos. The additional media volume handles the higher bioload more consistently than a hang-on-back filter at this stocking level.
29-Gallon Tank Maintenance Schedule
Water changes in a 29-gallon are more forgiving than a 10-gallon, but the maintenance frequency stays the same. A weekly 25-30% water change is the baseline for all four combos on this list.
The angelfish community and planted community combos produce higher bioloads and benefit from testing more frequently in the first three months after each stocking addition.
- Weekly 25-30% water change with temperature-matched, dechlorinated water
- Test ammonia, nitrite, and nitrate weekly for the first 3 months, then every 2 weeks once stable
- Rinse filter media in removed tank water every 3-4 weeks. Never use tap water on filter media.
- Trim dead plant leaves and remove before they decompose into ammonia
- Vacuum substrate at each water change to remove settled waste from the corydoras feeding zone
- Check heater calibration monthly against the external thermometer
Species That Need More Than 29 Gallons
The 29-gallon's popularity means stores stock several species alongside it that simply do not belong in this footprint long-term.
- Oscar fish: reach 12-14 inches and produce massive waste. Minimum 55-75 gallons for a single adult.
- Common pleco: grows to 18-24 inches. The bristlenose pleco in our combos is the 29-gallon-appropriate substitute, not the common variety sold as "algae eaters."
- Two angelfish pairs: two mated pairs in 29 gallons will fight for territory. One pair only in this tank size.
- Discus: require pristine water quality, very warm temperatures (82-86°F), and minimum 50 gallons for a small group. Not a 29-gallon fish.
- Large cichlid pairs: convicts, firemouths, and similar species are too territorial for the footprint. A single angelfish pair is the upper limit of cichlid aggression this tank manages.
Pick one of the four combinations above, cycle the tank fully before stocking, and add species in stages over 4-6 weeks. Weekly 25-30% water changes and a properly sized filter are what keep any of these combos stable long-term.
If your shortlist keeps growing past what fits here, see our freshwater fish pillar for the full range of mid-size tank stocking options.