Yes I agree with you on that but with the fx6, it's so much easier for water changes. If yoy ise it correcrly, yoy dont even have to warm up the water. And since these guys are messy eaters, I just want to turn the tank over 3 times per hr. Cut up shrimp and pellets 3 times a day has got me chaging the water every few days.That fish is going to get 10"+ long. Regular zz style flowerhorn males can reach sizes of 14" but yours looks like it's a stocky/short body so it should stay a little shorter. You have a nice fish. If you enjoy it and want to keep it I'd say splurge and get him a nice set up. You can save a bit on going with a less expensive filter. Fx6 are a very nice filter.... but overkill for a single flowerhorn in a tank where water changes are don't regularly IMO
As in how long is he? He's about 4.5 inches right now.How much is he?