this is the one that ate whole, an 8 inch common pleco... I've been buying feeder comets, 20 at a time , and it usually takes a week or a little more, for it to catch them all... I added 20 last night, and it ate some, but killed all the rest, within 24 hours... at least a dozen half eaten gold fish floating on the surface... I moved over my canister filter, with the UV light, as the water was getting a little skanky... if it doesn't finish them in the next day, I'll net them out, and it'll be water change day... looks like it has become a beast, with more desire to kill, than to eat... I may have to buy it larger gold fish... it was originally getting rosy minnows, but about 6 months ago, I switched it to feeder size comets