0.12...what sort of reading is that? I really only measure my salinity using specific gravity...thus I maintain 1.024~1.025 on my tank. Are you just off by a decimal, and have 1.012? If so, that's indeed far too low. get your levels up ASAP
, so your water has a little time to age before you start adding fish.
Water chemistry is crucial to SW
fish and especially inverts.
water for evaporative top-offs is correct. this does NOT lower your salinity, because ONLY water evaporates...salt and other minerals remain in the water. Thus either you've always had a low salinity, or your method of measuring salinity is flawed and you're not getting valid results (primary reason I use a refractometer instead of floating or swing-arm hydrometers)