i dont think they do get on with GF very well, when the grow bigger, they can get aggressive and try to eat the slim coat from GF (chase them and attach themselfs the the GF). i have watched this in an lfs before....
If it is the same loach as i have, i keep it in my topical tank, she seems to get on mone in there, leaves the other fish alone, but the other fish are much smaller than her. (she is about 4" now)
I have hill stream loaches in my GF tank to eat the algae, also called hong kong plecs.
Hope this helps