I just came into a 55gal that I plan on transferring my current black water to. I currently have a mudskipper in that tank (I know the requirements but he was in far worse conditions at the pet store but he seems happy and I've had him for over 7 months so don't flame) but I want to get him into more of a mangrove tank. Being that he seems to hate water would it be okay if I put a puffer in the "pool"? Is there anything that can defend itself from such a grumpy flat mate?