Hi all. I have 2 labs, 2 blue acai & 5 tiger barbs in a 36 gal bowfront. All but one of the cichlids is acting strangly, ie rubbing on rocks, swimming like crazy or hiding out which they never have. water tested 0 nitrites, 0 ammonia and 10ppm nitrates. sny help would be appreciated. they have me quite worried. Thanks