I got 6 baby red snakeheads in my tank with fire ee,l 4 convics and 2 belheri snakeheads, and a payara, and 3 gold fish, I got the red last and they were only 5" or so, since then I have been trying to sell off my other fish with no luck, well since then they are now 8" or so, eaten 2 of the convics until I woke up and removed the other 2 into a new tank, last night they ate one of the bleheri, well were in the process when I noticed the commotion in the tank and removed it, but it died from its injuries last night, they take shot at the payara from time to time, but the payara is very placid and about 10" so they tend to leave him alone as he keeps far away from the school at all times, and I cant seem to get rid of it yet but still trying, and the fireeel is about 15" and hides all the time s they don't bother at all with him, the only thing they don't mind are the 3 goldfish lol, they have become part of the school, the gold fish and the snake heads move in one giant pack and eat anything and everything when it hits the water now lol killer goldfish lol who would have thought. I recommend you get rid of everything in the tank and just keep red, or they will most likely do it for you, im sure being how mine are one big school is much worse as mine compete for food and really violently shred everything I feed them, I put whole fish in about 6-7" in every day or other day and they rip it to pieces and tear it out of each of there mouths upon entering the water and don't stop till they have eaten every last bite.