I have a 170 litre tank with 5 clown loaches, 1 bulldog plec, 5 cardinal tetras and 5 neon tetras. I would like to get a few new fish that will go well in this tank with my exsiting fish but I have ran out of ideas on what to get. I don't want angels, guppys, mollies or gouramis as I have had a few of them in the past. Any ideas?