I saw a albino clown knife at my lps, I would like to get one but IDK if I should. I have in the tank a tigerfish, 2 H.scombs (payara) and a retic ray. all of my fish are the same size as the knifefish. would the knife pick on the ray or the payaras? the payaras are kinda slow eaters also. please let me know soon, Idk how long they will be at the shop, thank you!