I was at Petsmart today and saw they had some gobies. I've heard gobies do well with puffers so I started asking questions about it, size, food, etc. I almost forgot to ask if special water conditions were needed when the person I was talking to told me that it is a brackish water fish and to make sure I had salt in the aquarium it was going into. it was obvious I was planning on getting the fish, but luckily they warned me first. I ended up getting some ghost shrimp for my puffers instead.