my buddie has a 120 gallon african cichlid tank mostly mbuna and malawi all juvenile(23 fish total). he has lost 4 fish in about two weeks. symptoms are: loss of apetite, hiding all the time, then death. but recently i sawone of his fish just die out of no where all of a sudden the fish just started spinning and looping around all slow and trippy like and then died. i told him i would find out whats going on. please help.