![welcome [welcome]](./images/smilies/welcome.gif)
Good luck getting these guys into the ideal conditions you have researched. Just a few tidbits of information, sorry if it's a repeat of what you have already read.
Keep their salinity 1.003 - 1.005. A lot of sites suggest a higher salinity, but they live longer in the lower range. Use marine salt to mix their water, not any other kind of salt. Use an aragonite substrate to maintain the KH. Make sure your salt is mixed thoroughly for several hours before adding to the tank. If the tank is freshwater at the moment, take 2 weeks to hit your target, raise no more than .02 a week to keep your bacteria intact.
15 gallons minimum per figure 8 puffer.
Some feeding ideas, you can get some non-seasoned, uncooked seafood from a grocery store, like mussels, shrimp, squid etc. I also like to include tilapia and earthworms to offer some thiaminase (An enzyme that inhibits the body's ability to uptake b1) free/low food sources. If you can get cockles, they are the only shelled bivalve I am aware of that does not contain thiaminase, so that is an excellent choice. If the seafood is fresh, freeze it first, and thaw/ soak the food in a bit of tank water (Don't use straight tap) with the addition of vitamins, such as vitachem and Selcon to make sure they are getting balanced nutrition, as freezing does break some of the nutritional value, but it is important to freeze to kill bacteria and or parasites.
And of course, pond and/or ramshorn snails are fantastic.
It's a good idea to treat them for internal parasites as well, you have to soak his food in medication. Get Jungle Fizz Tabs Parasite Clear, break off a piece of the tab and drop it in smallish container, and put a small amount of tank water in it, enough to cover the food you intend to soak. Add the tabs and some pressed or chopped garlic or garlic extract. Allow the food to marinade in the solution for about an hour. Feed him like this 3 -7 days. If you don't have Jungle products available to you, check for a medication containing praziquantel and/or metronidazole.