09-01-2008, 06:14 PM
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Let me try to explain a little better.
He bought a Green Spotted Puffer that was sold in freshwater and is currently being housed in a 10g freshwater tank. Deku was informed that this is a brackish fish that eventually needs nearly full marine conditions. So, he's asking what he must do to turn his 40g tank into a suitable environment for the fish, and if he'll need something like a FOWLR setup.
I wouldn't mess around with any of that "instant cycle" stuff. I've heard of it working just fine, but I've also heard of it being a complete waste of money. Personally, I would set up the tank as a low-level brackish (i.e. with a specific gravity of maybe 1.003-1.005) and do a fishless cycle. Then, you can add the fish and slowly (as in over at least several months) increase the salinity of the water to high-end brackish.
I doubt you'll find any invertebrate that can survive with a puffer. Since you'd be starting with such a mildly brackish environment, you won't be able to use live rock or live sand. At that point, you treat the tank as if it's a freshwater tank.
I'm no expert on saltwater, though, so I can't help you with what sort of setup would be appropriate for a high-end brackish tank or at what salinity you can start adding things like live rock and sand.