Yesterday i was feeding my fish and then i see my red belly was missing half of his tale then i see my FH was badly scaped on it's side and i think its getting worse please tell me what to do.......... they are fighting as i speak what can i do?
separating the fish is the only way to resolve the situation. those two fish should not be tankmates, especially in a mere 100g. Put a divider in the middle of the tank if you can't sell off either fish immediately.
Tell me you don't seriously have a pirahna in with a flowerhorn? What on earth gave you the idea for this mix? Agreed, that combo simply will not work - as you're clearly seeing - and you need to divide them ASAP, pick which fish you want and get rid of the other, or get a whole other tank to split them up.