I have two Green Spotted Puffers in a 20 Gallon freshwater tank one puffer is about an 1in long and the other is almost 1.5 inches. I am updating my 55gal to a 210gal and would like to move these guys to the 55gal. I am looking for some ideas of what kind of water to put them in when i move them,should i keep it fresh then slowly move it up? I plan on keeping these guys in the 55 for awhile. Some research that I have done said that the older they get the more salinaty they like. I would like to get them out of the freshwater...any suggestions. I love these little guys and can't wait to see what they will be like when they get bigger.