29 Gallon Tank Overview
The 29 gallon aquarium measures 30" × 12" × 18" — the exact same length and width as a 20 Long, but with 6 extra inches of height. This additional vertical space opens up stocking options that the shallower 20 Long can't support, most notably angelfish, which need at least 18" of water depth to develop their tall body shape properly.
At 330 lbs filled, a 29 gallon definitely requires a proper aquarium stand. It's a substantial tank that provides real presence in a room while remaining manageable for intermediate aquarists.
Best Fish for a 29 Gallon Tank
Angelfish Community
A pair of angelfish with 8–10 rummy nose tetras and 6 corydoras catfish. The 29's height is perfect for angelfish, and the tetras are fast enough to avoid being bullied. Avoid small fish like neon tetras once angelfish reach adult size — they may become food.
Pearl Gourami Community
A pair of pearl gouramis (one of the most beautiful freshwater fish) with 10 harlequin rasboras, 6 kuhli loaches, and a bristlenose pleco. Peaceful, elegant, and easy to maintain.
Dwarf Cichlid Breeding Tank
2–3 pairs of German Blue Rams or Apistogramma with a school of tetras. The extra height provides territory separation, and you can observe fascinating breeding and parental care behaviors.
Large Community
12 neon/cardinal tetras + 6 corydoras + 6 cherry barbs + 2 honey gouramis + 1 bristlenose pleco + nerite snails. A vibrant, active community that showcases fish from all water levels.
29 Gallon vs 20 Long
- Same footprint (30" × 12") — fits the same space and stands.
- 29 gal adds 6" height — essential for tall-bodied fish like angelfish.
- 50% more water volume means more stable parameters and more stocking capacity.
- Slightly harder to light evenly due to extra depth. May need a stronger fixture for planted tanks.
- More weight (330 vs 225 lbs) — a proper stand is non-negotiable.
Equipment
- Filter: AquaClear 50 (HOB) or Fluval 207 (canister). The AquaClear 50 is the go-to budget choice. A canister provides cleaner look (no HOB hanging off the back) and superior bio-filtration.
- Heater: 150W adjustable. The extra volume and height mean a 100W may struggle in cool rooms.
- Light: Need a 30" fixture. For plants, consider the Fluval Plant 3.0 (30") or Finnex Planted+ 24/7. The extra depth means you may need higher PAR output than a 20 Long for the same substrate-level light.
Maintenance
- Weekly: 20–25% water change (~6–7 gallons). Standard siphon with gravel vacuum.
- Bi-weekly: Filter maintenance, plant trimming, glass cleaning.
- Monthly: Deep clean, equipment check.
Frequently Asked Questions
Can I keep angelfish in a 29 gallon?
Yes — a pair of angelfish works well in a 29 gallon. The 18" height is adequate for their body shape. Don't keep more than 2 angels in a 29, and avoid keeping them with very small fish that could become prey.
Is a 29 gallon good for beginners?
It's fine for beginners who want to skip the smaller tank phase. The larger water volume is actually more forgiving of mistakes than a 10 gallon. The main consideration is the stand requirement and higher startup cost.
How many fish in a 29 gallon?
Approximately 20–25 small fish or fewer larger fish. A well-planned community with fish at different water levels makes the most of the available space.