https://tetra-fish-care.com/congo-tetra-phenacogrammus-interruptus I tend to go for 8-10 Congo, and more than this for the smaller tetras, provided the tank is large enough to accommodate them (I'll come back to tank size). I'll come back to stress too. Two Congo tetras will be under stress. Congo tetra, like neon tetra and any tetra species, is a shoaling fish; it lives in groups of usually hundreds, so it must have a number of individuals in an aquarium.

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