Ok, My cousin bought 6 tiger cichlids 3 male and 3 female I believe. And after a few days we notice some changes to the tank water. Its the filter. The filter can't do the job on the 50 gallon tank. Does anyone here have a 50 gallon tank and what filter you use? And also can Cichlids and algea eater in one tank? The Cichlids won;t eat them right?