the CHEAPEST food you can give your cat is fish that you catch from a lake by you as someone stated...i do 3-4" sunfish for my 12-14" tsns they eat one a day or every two days and i also feed fillets and market shrimp as they are often found at the store buy one get one free...just watch for sodium benzite?(presurvitive) it can kill your fish...as for massivore, i don't feed it as it is $30 a bag by me and a bag wouldn't last long for my 3 cats, aro, gar, bullhead, and jd...as for squid my fish wont take it except my gar and jd but the cats taste it and reject it...wc fishes are full of vitimins so i see pellets as not needed if you feed wc feeders as i mentioned...just make sure you give it a good, right sized home with foods that have been metioned and as for hotdogs i have thrown a few in just to see if they would eat them and the hotdogs f'd my water up so bad that to me it is not worth it...not to mention the colors of your fish could not look as good as they could be...i know a guy that feeds hotdogs to an aro in a 55gal...not my idea of great care for a great fish and the colors and growth show that, but he is content so i can't take that from him, all i can do is say what i feed mine, show pics of mine colors, growth and space...and hope that he will "see the light"...i also offer to take the fish to help him out, but what else can we as keepers do right? and not insult others that haven't found out the "correct" ways to keep fish, just help them as they need it...i say "correct" cause we take fish from a huge river/lake to put them in a box of all sizes for our enjoyment so in a way we are all wrong but that is human nature