The Thera a +a or whatever I think is supposed to be the best. But yeah, the ingredients looked the same to me. I tried the 1 mm pellets but the fish couldn't eat it (Endler's) and the frogs didn't want to. I think I saw a male eat one though. I think once I get a feeding dish in the tank I'll soak some of these tiny .5mm (they're actually much small than that) pellets in with the blood worms first. Might give them more of a taste for them. They're super small but I think if I can get them into the dish (they sink!) with the worms they'll eat them. If they don't, someone else will!