I found this site the same day we brought home our puffers from wal mart and discovered...uh oh...the sales person really didn't tell us what we were in for buying puffers. I used Yahoo search

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Thank goodness for what I found because it probably saved our little puffer fish from dying. I have never had to research any animal to the extent that I have had to owning these fish and I have owned many different animals. Everything from horses, birds, cats, dogs, hamsters...whew...puffers are the most delicate out of them all. I don't want to even try a pure salt water tank for a long time!

55g-2 green spotted puffers 1 year old Nov 08!
20g-5 leopard danio,4 whiteskirt tetras, amanos, nerita snails, 2 neon tetras