Java fern or java moss seems to work ok with loaches. My anubias on the other hand gets chewed especially when they get hungry. If you use driftwood make sure the holes or crevices on them are not small enough for them to get stuck in. I actually don't like driftwood that has them since loaches will just tend to hide in there the whole time. Also loaches love a lot of currents in their tank. If you're going to do a loach specific tank then you might as well do a river type system where there is one directional water flow. Like this for example http://www.loaches.com/articles/my-clown-loach-aquarium