I have a ten gallon tank that contains five serpae tetra, an algae eater fish, and small catfish. I have all artificial plants, a large rainbow rock and a clay pot that my catfish hides in. I am interested in keeping two or so larger fish in this tank, but I have had problems with my tetras fin-nipping in the past. A few months ago I tried adding two angelfish and the serpae made their lives miserable by constantly picking on them. Unsurprisingly, the angels both died a few weeks later. My question is could I keep two dwarf gouramis with these tetras and, if not, what fish could I keep with these tetras that they wouldn't attack? Has anyone else had problems like this with serpae tetras in the past?