When keeping Flowerhorns filtration is very key. These are large messy fish so you need more than adequate filtration. The Flowerhornlove.com rule of thumb is to have more than or right arounddouble the filtration rating on your aquarium. For example, in my 60-gallon aquarium, I have 1-AquaClear 110, 1-AquaClear 70 and a Fluval 406 canister filter. So per the manufacturers, I’m equipped for 280-gallons but this effectively keeps my 60-gallon aquarium healthy.Below you’ll find recommended filters that we actually use on our tank setups. Check out an in depth comparison of popular filters in the hobby here.