Resident Aquarium Nerd
Join Date: Apr 2004
Location: Murfreesboro, TN
That's a Green Spotted Puffer. Oh man, I hate how stores sell them without telling people all of the care involved.
How big is the tank? The GSPs are going to need their own aquarium, separate from any other fish he bought. They get to be six inches long and I would suggest nothing smaller then a 55-gallon for both. You'll need a good filter because they are messy fish.
GSPs don't usually do well in freshwater long term and should be carefully acclimated to a brackish set-up. You can keep them in a brackish tank permanently but keep the salinity up more on the higher end (SG 1.015-1.018). I would recommend moving them to a marine tank when adults, though, if you can. A SG (specific gravity) of 1.020 should be fine.
They also won't do well if they're just fed flakes/pellets. Try to offer a variety of live and frozen foods...krill, gut-loaded ghost shrimp, brine shrimp, and snails are all good choices. The snails are necessary for healthy tooth growth as they keep the teeth worn down.
You'll need to keep the tank pretty warm and the pH high like most brackish/marine tanks. A temperature of 78-81 degrees Fahrenheit and a pH of around 8 should be good.
If possible I would just rehome them unless you're willing to set up a separate tank like I described.
The one with the larger belly just looks full, not sick or anything. Keep an eye on him just in case.
"We weep for a bird's cry, but not for a fish's blood. Blessed are those with a voice."
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