The bio media is all new and cycled, went thought the ammonia and nitrite spike beginning due to over stock. Now only left phosphate which is high but is doing water changes every week to bring it down. After adding the air pump the PH is stable from morning to night. For salinity, I'm using timer plug to control the fan runtime so the evaporation is not that bad and water is top up constantly to maintain. Max swing is between 1.025 to 1.0255. Thinking about buying the chiller but is like over kill. I guess maybe I'm just suck at choosing the fishes, mostly all die within 1 or 2 days. Maybe I should go other LFS to try...