I am looking for a 50 gallon or 55 gallon tank to rehome my pleco (see sig) and was wondering if I could put killifish with him and maybe get some black tetras. Here is the kind of killifish I think look good and might want to get. http/www.fishesnpets.net/gallery/killifish/redkilli7.jpg and this http/www.killifish.com/images/guentherigold.jpg thanks in advance.