A flowerhorn is a great fish(singular.) They are as tough as a truckers a%*, can take a lot of water and temp. neglection, will eat just about anything, grow very fast and look great. (Even a $10 fish) The only neg. is that you'll be lucky to keep it with any other fish(s) after it gets over 4". If the flowerhorn cannot kill it's tankmate, that is only because its tankmate will kill it. If you didn't know, they are a decorated Red-Devil. If you feed them right, it will be pushing 12" in 8 months. Mine broke a glass water heater when he was 5". Don't waste your time with decorations either. Aside from a large, broken clay pot, they can move just about anything; tubing, powerheads, filtration. Mine loves to move rocks with his mouth. Most large Cichlids do though. If your 50gal is still empty, it will be more than enough to meet the red-eyed monster's needs. They are very mean and have a nasty bite. Good luck, they're really cool and easy to care for.