when i first started i had 2 clown loaches and red tailed black shark. after one cown loach died my second latched on to the shark . 3 years later there still best buds(and are very healthy. at first i was concerned because the clown loaches was ment to be kept with others but he seems perfectly happy so i am leaving them be they make quite a couple and the clown loach has picked up habits and now chases my swords