Ultimate, if you do pickup a filamentosum, i'd pickup a small juv. speciman... (if you have spare tank space? divider, or 'grow-out" tank??)... Much easier to train on taking dry/frozen/non-live foods, when at a younger stage. Beleive me, seeing a big azz, thick WIDE-HEADed, fat pim. cat go up to the top and feed, is a pretty amazing sight!!... with it's mouth clapping and splashing at the surface!! Totally Unreal!! Shoot, I wouldn't mind picking one up again!