I have 3 glass eye squirrl fish and one cardinal fish in 55. I do regular top-offs once every or other day, basically whenever the sump is running low. *I add salt water (mixEd in a 5 gal bucket using spray nozzle). I noticed my squirrels get grains of salt stuck to their skin and fins. They don't have scales more of a rough type of skin. my cardinal has larger scales so it doesnt look like much sticks to his body, some on his fins. Do you think its because I don't let the water sit long enough for salt to desolve? Or, do you think its because there's too much salt n the water? I checked the hydrometer and it was acually reading lower but the hydrometer is kinda old.