Best Fish for 80 Gallon Tank Guide: Community Picks

Choosing stock for an 80-gallon aquarium (303 L) is the most enjoyable part of the build, but also where most Singapore hobbyists overspend and overstock. This best fish for 80 gallon tank guide lays out proven, parameter-matched combinations using species we have kept for years at Gensou Aquascaping, 5 Everton Park. A 122 cm footprint opens doors to mid-sized shoalers, genuine centrepiece fish and even some gentle predators — provided your water chemistry and filter turnover can support them.

Matching Stock to the 122 cm Footprint

An 80-gallon rectangular gives you roughly 5,600 cm² of floor area and 53 cm of vertical swimming room. That is enough width for fish that cruise rather than dart — think rainbowfish, angelfish and Geophagus — while still supporting dense schools of smaller tetras along the midground. Height matters less than floor area for most species, which is why an 80 long often outperforms a 75 tall for stocking flexibility.

South American Community (Soft Water, PUB-friendly)

Singapore’s soft PUB tap is ideal for an Amazon biotope. Our favourite mix: 30 cardinal tetras (Paracheirodon axelrodi), 12 sterbai corydoras (Corydoras sterbai), a pair of Bolivian rams (Mikrogeophagus altispinosa) and two angelfish (Pterophyllum scalare). Add 6 Amano shrimp if you run planted. Expect SGD 220-260 total from Iwarna for the full roster; quarantine separately for two weeks before mixing.

Rainbowfish Showpiece

Rainbowfish reward a large footprint. Stock 15 Boeseman’s rainbowfish (Melanotaenia boesemani), 15 dwarf neon rainbows (Melanotaenia praecox) and a single school of 20 Congo tetras (Phenacogrammus interruptus) for a colour explosion under planted lighting. Males colour up when housed in groups of 8+ with a slight female bias. Feed a rotation of frozen bloodworms, Fluval Bug Bites and New Life Spectrum to maintain fin colour and finnage.

African Rift Lake Option

If you prefer cichlids, an 80-gallon makes a respectable Tanganyikan setup. Try 20 Cyprichromis leptosoma “jumbo” up top, a pair of Julidochromis regani on rockwork and 8 Neolamprologus multifasciatus in empty snail shells. Remineralise with Seachem Malawi/Victoria buffer to GH 10-12 and KH 8-10 — PUB soft water alone will not sustain these fish long-term.

Geophagus Show Tank

For an earth-eater centrepiece, 6-8 Geophagus tapajos “red head” over sand with driftwood create mesmerising sifting behaviour. Pair with 20 rummynose tetras (Hemigrammus bleheri) as dithers and a single bristlenose pleco (Ancistrus sp.). Use pool-filter sand or very fine inert gravel — ADA Amazonia capped with sand works, but never expose sharp substrate grains that damage gill filaments during sifting.

Planted Community with Centrepiece Gourami

Heavily planted 80-gallon tanks suit pearl gouramis beautifully. Stock a trio of pearl gouramis (Trichopodus leerii), 20 harlequin rasboras (Trigonostigma heteromorpha), 10 glowlight tetras (Hemigrammus erythrozonus), 10 kuhli loaches (Pangio kuhlii) and 15 Amano shrimp. Low current suits the gouramis; a twin-outlet lily pipe returns flow without scouring plants.

Species to Avoid at 80 Gallons

Eighty gallons feels large, but some commonly sold species still outgrow it. Skip oscars (need 125+ gal), common plecos (reach 45 cm), tinfoil barbs, bala sharks, arowanas and red-tail catfish. Silver dollars work in groups of 8 but will mow down soft plants. Clown loaches can be kept juvenile, but plan an upgrade to 180+ gal by year three as they push past 25 cm.

Quarantine Protocol for Bulk Stocking

Dropping 40-60 fish into a new tank at once is a parasite lottery. We run a 40 L quarantine bin with an Eheim Skim intake, two weeks per batch, treating prophylactically with praziquantel for tetras and metronidazole for cichlids. Iwarna and Nature Aquarium Gallery both quarantine in-house, but a home QT still catches the stragglers.

Feeding a Diverse Community

Rotate four foods across the week: Fluval Bug Bites flake for surface dwellers, New Life Spectrum 1 mm pellets for midwater, Hikari Sinking Wafers for corydoras and plecos, plus frozen bloodworms or brine shrimp twice weekly. Feed twice daily, only what is consumed in two minutes. In Singapore’s warm water, fish metabolise faster — small frequent meals beat one large serving.

Singapore Livestock Sourcing

Iwarna Aquafarm at Pasir Ris remains the most consistent source for quarantined tetras, rasboras and rams. Y618 at Serangoon North carries cheaper but less-quarantined Geophagus and rainbowfish. Nature Aquarium Gallery Thomson stocks tissue-cultured plants and higher-grade angels. Polyart occasionally brings in wild-caught Tanganyikans by pre-order. Always ask for water parameters before bagging — matching GH matters more than pH for acclimation.

Related Reading

• Community Fish Compatibility Chart
• Corydoras Care Guide
• Angelfish Care Guide Singapore
• Rainbowfish Species Guide
• Geophagus Care Guide