what is this

Hello, newbie question. Can you please identify the cichlid for me? Looks like a pretty common one. The LFS guy said he forgot the name of the fish. He remembered the price tag though. Sold it to me for less than a dollar. This cichlid looks quite aggressive to me. Have put it in quarantine tank...

My flowerhorn has one fin healthy the other fin has some sort of red sore I guess on the Finn any ideas to what it may be and y

is this rare? thinking about getting but not if its super common. the seller says its aggresive