if you reduce the stock to only 2 fish,then 1 will end up beating down the other.butti is a large growing fish,at 2 inches it really won't show much confidence in that 75 yet.if you really want him,take the others back,get tougher target/dither fish,SD,tiger barbs,giant danios.he can grow with them,but they will probably not last when he hits 6+