I had dwarf puffers and they were mean so I never tried anything else besides bumblebee goebies but since the lfs store told me the bb's were freshwater, I didn't have a problem. Unfortunately bb's are brackish and adding salt to my tank would have killed the dp's. DP's are so specialized in their care, I had a hard time keeping them due to parasite problems they always brought in. I couldn't keep a batch parasite free so I gave up. I still have the gobies, they are fine, it's been about a year. I feel horrible that they are in freshwater, but they are still alive, eating, and looking good. I wouldn't advocate going out to buy bb gobies, but maybe another gobie would work? I don't know about freshwater gobies or if they would do well with the puffers. I picked bb's because they were small and seemed to have similar color patterns as the dp's. I think that's why they did so well together. Good luck!
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