I have 3 aquariums set up now. A 90 gallon aquarium that is stocked with 2 Electric Blue Jack Dempsey Cichlids, 2 Firemouth Cichlids, 2 Clown Plecos and 3 Cichlids a friend gave me and I'm not sure what they are. A 55 gallon aquarium with several Black Convict Cichlids. And a 20 gallon aquarium I use for a grow out tank for Black Convict Cichlid babies. I'm running a Fluval FX6 on the 90 gallon aquarium a Fluval FX4 on the 55 gallon aquarium and 2 sponge filters on the 20 gallon grow out tank. Thanks to the help and recommendations I got here at Cichlidaholics from @OB Guy a few month ago I went with the Fluval FX6 for the 90 gallon aquarium and a Fluval FX4 on the 55 gallon aquarium and 2 sponge filters for the 20 gallon grow out tank and couldn't be happier with their performance.