I don't know if I want to take the risk with the whiptail I might have to rethink this one. I did think of getting Pencilfish instead of the hatchets but the hatchets are just so different looking and a little school of them would look awesome I think. As for the Cardinals I have had them before and they weren't picky at all, yes they are beautiful but I think rummynose tetras are as well. Next pay day I think I will get some more cories if they have any and maybe a pair or German Blue Rams.