my tank was run with a hydro for about 3 years. my bro didnt have many problems with the tank, but it didnt have THAT much life in it. well i inherited the tank about a year ago and have since used the hydro. there was only 1 clown, 2 damsils, and a hermit in the tank. but when i finally purchased a refracto, my first test showed 1.033 salinity. and yes, the refracto was calibrated. now that i have the refracto, i keep it around 1.026 and everything is doing great. i have since added a snowflake eel and a CUC.
and if u look around, you can get refractos pretty cheap. i got mine off e bay, its brand new and i think it came to like $28 shipped.