If clown loach are happy and active they will make a right mess of your plants when they get to about 4-5", there are other better suited loaches
if you do keep clowns a group of 6-8 should be minimum and dont buy them if you think you'll take them back when they start doing damage
I'd love to have a nice planted home for my clowns
I'd have to disagree, at least for my clown loaches. Mine are now neither too small now nor unhappy or quiet(they race the glass all day long it get annoying and they don't pay any attention to plants except for swimming through them for cover.
From what I've figured my clown loaches need vegetable based food too in their diet and love algae pellets in addition to their daily meaty diet. And they'd click they heads off on algae pellets too, especially new era plec pellets or hikari algae pellets. Plus of course they love cucumber, melon, etc..
There's a video below of my 5 from a year ago but they've grown since, one is passing 5" and I bought a 6th clown @ 6" last year who's now nearly 7".
If anything, the only fish that ever ate plants in my tanks is a small bristle nose pleco who ate 3 large swords in no time. Even my common plec hasn't touched plants yet and he's 11" now.
Goes to say people have different experience with exactly the same fish.
If I was getting small clowns for a snail infested tank, I'd feed them just algae pellets as a supplement until the snails are gone which could be quite fast then add meaty food to balance the diet to 50-50% ratio with the vegetable based food. It takes years for them to reach 5-6" so I wouldn't worry about that for a good while.