Seems like all the fish discussed in the above threads lacked tank space and were kept in low numbers.The
the op was talking about a 300 gallon tank. I think it would suffice for a shoal.
The most common pink tail is the ery and the one most people refer to when talking about this fish of the 5 or so species.
The only correct way to keep these fish is like most other characins , in shoals just like they behave in the wild.
Seems like all the fish discussed in the above threads lacked tank space and were kept in low numbers.
Pink tail chalceus when kept in a shoal are not aggressive. When kept singular or in groups of less than six they pick on the weakest as a true pecking order can’t be reached. I’ve seen many tanks and have kept them myself in groups of more than six and they behave just fine.I keep medium and large African and CA/SA cichlid and tried many large schooling fish, including bleeding heart tetra, diamond tetra, Congo tetra, Tiger barb, brilliant rasboras, black neon, red fin tetra, rosy barb, roseline shark and so on. I have to grow them out in separate tanks to reach sufficient size before introduction to the Cichlid community. Still I always lost a few fish in the first few days as newly introduced fish are skittish and trigger attack instinct from cichlid. But once calmed down, my cichlid surprisingly would ignore schooling fish that fit into their mouth.
Large is relative. Lungfish can grow to 4 ft, so you need are monster size schooling fish. Bala shark and tin foil barb get large, but they eat plants. Pink tail Chalceus get big, but they dont move or school much, and behave more like cichlid in conspecific aggression. Clown and Tiger loach will school and reach monster size, but retailed size are small and take years to get big.
Schooling fish need a minimum of 6 and the presence of large tankmates to exhibit schooling behavior. When I grow out schooling fish in their own tank, under no threat they don’t school but spread out all over the tank. Also, juvenile fish shoal more than adult when they will engage in mating competition.