I have a red devil , green terror , firemouth , bifas ,and flowerhorn as well as some clown loaches, silver sharks and a pleco. No aggression yet . Have a powerhead and canister to filter
thats a little to much sand for me your blocking your center piece with the plant try to put it a little to the left but other than that its good to go
Agree re: the plant. Needs to be off centre a little...maybe even just beside the driftwood to encourage the eye in that direction, rather than dominating front and centre.
I like it, though. How bout a couple pics of your Flowerhorn??