I bought what I think it a Tetraodon nigroviridis about 6 months ago. The store had it in water with a specific gravity of 1.016, but because this did not correspond with most of the research I’d done, I took it down to about 1.005. Do you agree with this, and is this puffer that specific as to what its salt level can be? I ask for two reasons, which I hope you’ll comment on. First, the puffer is now much less colorful than it was when I first got it. It went from a bright yellow with distinct spots to a dull grayish color with less distinguished spots. I’d like the brightness, but I also want the fish to live. Secondly,
