I dunno if its so much what I feed them, as it is what they eat
LOL
I got them to take care of my snail problem. Boy, did they ever. I actually keep snails in my QT atm so they have snacks; I initially think thats how they got so fat
LOL
I purchased Hikari Tropical sinking wafers for them specifically. Not only do they eat that, they also eat the foods I give the other fish (Bio-Blend pellets, Spectrum pellets, Tetra flake, Hikari algae wafers, freeze dried bloodworms, frozen bloodworms) and they also go rooting for nematodes in my substrate. Actually, there isn't anything they DON'T eat
LOL although the sinking wafers seem to be a fav; gets em all clicking. Tomorrow I'm going to try some blanched zucchini (its actually for the plec, but I have a feeling the loaches will be taste testing that too *grin*). The tank is fed 2x a day; occasionally 3 when I throw in a little frozen bloodworm.
Its hard to see in my pics, cause its near impossible to get a decent pic of them in a group, but the largest one is a diff shape then the 2 smaller ones. The smaller ones look more like yours...more stream-lined. The big guy more resembles pics I've seen of mature loaches on loaches.com. Is why I posted there; I thought something was wrong since he didn't look like the others. Apparently, because he's the dominant loach (and there is NO question about that) he is getting more food, so he's fatter and larger then the other 2. Not that they are near maturity; the big guy is almost 3 inches and the smallest about 2.