no I got a heater for it had the heater for awhileSo, had the fish only under a week, uncycled 10 gallon on the floor, and it is heated with a red light above the tank right? Get the fish into a suitable setup asap, and then give it a few weeks to recover. I bet it will come around.
I would also just get a 75 gallon, that's really the bare minimum for a flowerhorn unless it is a shortbody. In my opinion at least.

