Hes going to be alone with a oscar or blood parrot. I will make sure he has lots of caves.
In a 100 gallon I'm sure that's gonna be fine, on a side note these catfish are aggressive eaters. My friend once had 6 the size of an inch and a half. He fed them blood worms and didn't realize that they will keep eating past being full. They all developed a bloated stomach and floated to the surface and died so just make sure your feeding small quantities at a time even with those bigger fish because most likely they will beat your cichlids to the food. Good call adding a cave hell most likely hang out there most of the day. Mine stayed in his main spot but when he saw me he would come to the front of the glass and hang out. What are you making the cave out of rocks or driftwood?