55 gallon tank, my current stock is 1 bristle nose pleco, 9 small tiger barbs and 1 red tailed shark. Nitrates and stuff 0, ph 7.9 I not sure why but my tiger barbs are hiding behind the power head of my tank I recently introduced them about 2 weeks ago and they were all chill and doing their thing. Now their all cramped in the top corner of the tank, i think this is happening because i have a RTS and he's always chasing them around, it does have 2 cave structures and 2 pieces of driftwood but other then that its a very open tank. Also I left the RTS alone for 3 days would that be a problem. Any suggestions i was thinking more hiding places would do the trick.