One thing about my clown loaches (I have 9 of them, ranging from 3" to 6") is that they eat a lot. It's natural for them to munch on the plants IF you don't satisfy their needs.
I'd say that I wouldn't change a thing with my clowns & tank. It's planted - rather densely (although with cheap - common plants), never-the-less it's a planted tank.
One big plus of having them? I've never have any problem with any snails what so ever... even MTS!
They are rather smart fish. Able to memorize "good eats" & how/where to get them - once they taste your plants, then that's it.
flake food alone is a very boring diet for them - I vary their diet with live tubifex, frozen bloodworm, freeze dried bloodworm, flake, shrimp pellets, algae wafers, cucumber & zuchinni
Eheim Pimp Club Member #74