My gar is about 20 cm right now and my redtail is about 12 and his head was bigger than the gar's mouth so I put it in the bigger tank where the gar is and I didn't see the incident but the redtail's skin was ripped off. I put the redtail in the quarantine tank and it fully healed but I'm not sure if I should put him in a tank with the gar. Is there any way to stop the gar from attacking?