Had an empty tank.. Decided to try my hand on a puffer fish.. But... What is it??
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+1 spotted pufferbetter closer picture would help but it looks like a tetraodon nigroviridis. spotted puffer. they're brackish water fish.



Green spotted puffer. They are cute as hell but will relentlessly pick at every fish it is with. I have had a few over the years in dedicated tanks. This will need to be in brackish water at .0015 at this age and as it reaches maturity they do best at .0021. Your ghost knife does not like brackish water so they are not compatible. The puffer will eventually stress the knife out so much it will die.
i would separate them and start going brackish with the puffer...