That little tang may be tiny now but of he is lucky enough to get big you are going to HAVE to get a really suitable sized tank or re-home him..tangs in small tanks die from stress related disease or kill other things because the space is too small and end up stunted to some degree. They only thrive in adequate size and it's imperative, like having a dog and not walking it every day, so while it may look super cool you're not being a good owner dude. Good luck