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so I got a 20 long with a 2-3 inch GSP puffer in it (do start about tank size needed and what not. he is small so for now this tank will work, I will upgrade him when he needs it) its freshwater right now. but I want to start changing it to brackish, the thing is idk how much sea salt I need to use to get it done. I have a 1gal tank I can mix the water and salt in. but idk how much, also my GSP looks to have ick on him to and that's why I want to move him to brachish ASAP. I also made a video u can see my puffer in and what I'm talking about in this post.