lot's of fish can go with gouramis...lot's can't too though. cories, khulies, tetra, danios, (maybe angel fish) white clouds, plecos(small breeds...you don't want a common plec) ottos, lots of fish.
some wouldn't work so well, like most cichlids, puffers, rainbow sharks(in my case atleast) anything big and mean.
I feed my fish once every other day...once a day is more than sufficient. If you feed more than once a day make sure to feed small amounts. Snail population is a good indicator of how much to feed. If you have very few snails then you are feeding fine...lot's of snails and you are overfeeding.