hi. I just started a bigger tank which means more water evaporation and more top ups. now my salinity drops rapidly. just want to know how to maintain my salinity level. do I need to add salt water once in a while into top up or what is best. thanks
Firstly get your self a refractometer or hydrometer to measure your salinity. It needs to be in the 35-36ppt range. Never add salt water to your top up water. Only now and again will you need to adjust salinity because of water loss through your skimmer, but this shouldn't happen very often.
Always use RO water for your top up that has less than 6ppm TDS, the ideal is 0ppm, but below 6 is fine.
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