I have a big flowerhorn which is mean ass hell and I can't seem to keep anything with even a two feet silver arowana. any of you guy have any luck with you flowerhorn setup? I am looking for a good tank mate which can handle the flowerhorns aggression. btw the tank is a 100 gallon. he is in there by himself with a pleco. I was wondering if a 13 inch redline can last with him thanks for the suggestions.