55 gallons is the most popular tank size in North America. 48 inches by 13 wide by 21 tall - generous footprint for community schools, cichlid pairs, or a starter saltwater FOWLR. Here's what fits.
Classic community. 1 angelfish + 12 neon tetras + 8 corydoras + 6 honey gourami juveniles + 1 bristlenose pleco. Peaceful, layered top-mid-bottom occupancy.
Schooling-focused. 12 cardinal tetras + 12 harlequin rasboras + 8 ember tetras + 6 amano shrimp + 1 small pleco. Heavy planted scape works best.
Discus-ready. 6 juvenile discus growing into 75g. Hold them in 55 short-term while target tank cycles.
Apistogramma + community. 1 pair Apistogramma (cacatuoides, agassizii, borellii) + 12 small tetras + 6 corydoras. Apistos are mild-tempered dwarves.
Mbuna African cichlids. 12-15 mbuna (Yellow Lab, Demasoni, Rusty Cichlid, Pseudotropheus saulosi). Heavy rockwork. PVC pipe hides. NOT compatible with peaceful community fish.
1 yellow tang + 1 ocellaris pair + 1 royal gramma + 1 firefish + 1 six-line wrasse + cleanup crew. No coral required - lower lighting cost. Skip tangs over 6" adult size.
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Browse community-friendly species →Practical bioload limit: 25-35 small fish (1-2 inch adults), 10-15 medium fish (3-5 inch), or 1-2 large fish (6-10 inch). Avoid the 'one inch per gallon' rule for compact-bodied or schooling fish - actual bioload depends on body mass and waste production.
Yes, ideal angelfish tank. The 21-inch height accommodates their tall fins. One pair or a single angel + community is the standard setup.
Ocellaris pair + 1 small tang (yellow or kole) + 1 royal gramma + 1 firefish goby + cleanup crew (10-15 hermits + 10-15 nerite snails + 1 cleaner shrimp). Mature the tank 90 days before adding the tang.
Recommendations on this page cross-checked against the following authoritative references and our internal vendor + breeder database.