I just made my enclosure for my new CWD (a baby) and I got all this water for him to play in. About 3.5 gallons worth. It's filtered and aerated already so I want to put in a few cheap fish with him to make it look cooler. What can of cool fish can I get that would be safe if he decides to take a bite out of them? I was thinking a hatchet fish looks super cool so maybe one of them. Also are those black striped algae eater fish okay to for him to eat if he decides to? It'd be nice to have one in there taking care of any growth from the UVA/UVB bulb.

Thanks.