Considering he was in like a .5 gal bowl before this thing, he's ridiculously happy.
When I was prepping the tank, I stole his castle out of his bowl, and he was MAD. Literally stared at me the whole time, flared up at me, wouldn't eat his blood worms.
After I put the blue rocks in, I shoveled them out of the front corner, and used some leftover black rocks from my sons tank, and filled the void, then placed his castle in the middle, and surrounded it with the smooth stones.
When I put him in it, he went crazy, swam around his castle for a solid 10 minutes LOL.
I was pretty surprised, didn't think he'd remember/react like that. Even now since I introduced the Corys to his tank today, he's only chased them when they go near his castle.