The two teaspoons per gallon equals 3.75 cups of salt in my 90. Does that sound right? Seems like a lot. Also, does fish age matter with a salt treatment? I have 6 one inch dovii in there at the moment. I was going to move them to a 360 today but will keep them in the 90 to treat the ich. Are water changes recommended during the treatment? If so do I replace the salt I lose during the changes?