I noticed my aro has been chasing his tankmates lately but he's showing particular dislike towards my rtgg. I'm observing my rtgg because he is acting submissive. He just stays in one corner when the lights are on and moves around when dark. He still eats but has what appears to be bite marks on his right side, not deep but missing scales. I have another tank on standby for him just in case. Aro is approx. 22" and rtgg 10". They've been together for 8 months now.. Tank size is 6.5' L x 3' W x 2' D. Is this behavior normal for silver aros? Thanks.