Thanks for the info, We also researched online & are at this very moment aclimating 3 green spotted puffers that we purchased from Wal-mart about 4 hrs. ago, The water has reached 1.018 sg & we will aclimate until we reach 1.020 sg, We bought the largest 3 they had which is about 2-2.5 inches long,, so far they are doing fine no signs of stress,,, we do have two other puffers in that tank we are aclimating them with dog face and porc. We dropped the salt level down just a little but hope it's not too low for them? So far everyone seems Ok ,, what level do you have your sg at?