I was advised in the store I purchased him from that he would grow to around 4". So I am not surprised in your post that you mention 5", either way I'm just glad to have knowledge of this.
I have already got a cave for him. He doesn't spend too much in there, he's usually out and about in the tank. But he does use the cave if needed.
My next concern is finding out his sex, however I wonder if this would be easier to do when he's a bit older. I don't know why I have called him a he up to this point, I guess it looks more like a boy fish rather than a girl fish ☺ but i'll find out in due time.
I have already got a cave for him. He doesn't spend too much in there, he's usually out and about in the tank. But he does use the cave if needed.
My next concern is finding out his sex, however I wonder if this would be easier to do when he's a bit older. I don't know why I have called him a he up to this point, I guess it looks more like a boy fish rather than a girl fish ☺ but i'll find out in due time.