My tank is. We picked up a ~25 gallon, and ours is about 28, iirc. It’s not an appropriate size. I know they keep growing.... up to 8 inches, iirc? If I recall correctly, the recommended tank size is in the 75-100g range, but we never had an intention of going that big in the foreseeable future, so you’ll want to confirm rather than rely on my recollection He’s seemed happy enough for the moment, but I’m sure he’d love to stretch his fins. He’s great at navigating rock work and caves, but with how fast he is, I can see where he’d really shine with more room.