I have a chance to get a free redline around 10" my concern is will it harm my stingrays, clown loaches 7", silver dollars 4 to 5" in diameter? I've research a fair amount and haven't found much at all.
google "channa micropeltes" or have a look at the youtube vids, this will give you a better idea of what they are like. Defo will eat the loaches and dollars not sure about the rays but is it worth the risk?
I can attest to the fact that it will eventually eat all your fish. Even at 10 inches if he cant eatem whole he will rip them in two to gettem down. Good luck with your setup
I don't know how you could have researched and not found out about the ferocity of redlines. Try looking for info on Channa micropeltes and/or Giant snakehead.