Flutter wrote:1. A 20gal tank is not large enough for one of these fish. You really need a 30gal tank but we recommend at least 55gal. These fish are active, intelligent, and grow pretty large. BW and FW tanks have different bacteria so moving a filter from one to the other is likely to kill them.
2. Gravel is not OK, you'll need aragonite substrate as these fish are high BW to marine.
4. Correct salinity is about 1.018 and up. Many keep them at marine conditions as it is cheaper in the long run and these fish live a long time. To measure salinity you'll need a refractometer or hydrometer, some marine salt, and a separate water container to allow your salt to dissolve prior to it going in the tank.
You might do well to find a dwarf puffer as they are small, FW, and don't live nearly as long. Since your kid is only 6 I imagine it is likely to become disinterested long before the fish dies. Plus they rarely have issues with their teeth.
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