OK, so my plan:
Next water change I am going to take some of the water from the original tank and add it to the new tank, let it run and level out for a few days, then slowly add the marine salts weekly until the needs of the puffer are met.
Would you suggest gravel or sandy bottom? I am going to try and find one on craigslist before going new, my breeding tank is only 5 gallon so that is not a good temporary fix since his bio waste is pretty extreme.
That sounds like a plan