Could also be that he swam into a piece of driftwood or rock if he got scared. Normally happens when you turn the tank lights on.
+1
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I dont know the difference between an AT and IT but will check it out. This guy is just shy of 10 inches. The only tank mate that could stand up to him would be a large blue malawi crab. Other tms include:
2 red scats (2")
2 green scats (3")
2 silver scats (8")
1 rogue FM
2 Mono Sebae (5")
2 Columbian Catfish Sharks (9")
I think the crab is a possibility. The dat likes to hide in the caves the crab digs out. The shell of the crab is about 4" across.