I've got two 20 gallon fish tanks. One has a bristlenose pleco and 5 tetras, one has 4 corycats and 4 nannostomus and a ton of plants. I am thinking of merging the two tanks as keeping both clean is a lot of work, but I am afraid the pleco will eat all of my really nice plants! The tank he is in now has some big anubias that aren't doing great, and no algae--I think because he is taking care of all of that. My other tank has Java moss, small anubias, java ferns, an amazon sword, and a val. It has some algae here and there but I have 3 nerite snails that keep it pretty much in check.