chances are your fish are just getting used to the new tank mates. otos can be shy, and tiger barbs are the exact opposite. i could easily see the otos trying to avoid them. check your water params too, just to double check. otos are sensitive, so if something is wrong they would be the first to show signs. you didn't do anything wrong with mixing barbs and otos. the rule on african and south american is cichlids. you just keep african cichlids with african cichlids. heck, i have otos in my african cichlid tank.
also, i would hold off on adding gourami and a shark. tiger barbs need a good amount of room, and 22g is a bit tight as is for them.
__________________ 100g paludarium, 2 Julie Dickfeldi with more fry everyday; 3 ocellatus "gold"
20gL, empty (saltwater perhaps?) |