Hmmmm could a red tailed shark and yoyo loach breed? I am thinking no, but mine are always together and are in the castle together like all day. Does anybody know if this is possible?
just varifying what ~T~ said. they can't interbreed. a lot of fish will find companions of another species to just "hang out with". it's really no differant than humans finding someone who looks different than us t obecome freinds with them.
i have seen many fish be freinds. my platty fry thinks it's a guppy since it grew up with a guppy and a JB parrot i have is always playing with the oscar. so it is good.