My rtc which has grown quiet alot seems to get picked on by my Channa asiatica , theyr about same size i noticed recently he had a mark on hes back im guessing its from the same fish the rtc doesnt do anything back tho? i thaught they could stand up for em self =/ , anyway its not that bad bite it will heal but ive seen this fish beeing aggresive to my other snakeheads too seems like hes one pissed off fellah should i wait and see what happens , or remove it ?