Always test RODI
water to make sure it's reading 0 tds
. Get a tds
meter to along wth that new refractometer.
tank is fine at 1.018 - 1.025 SG
. Consistenancy is key. You don't want it jumping up and down too much.
If you start adding corals then you want to maintain SG
at 1.024 -1.026.
Nitrates below 50 is ok for a FOWLR
tank. The goal is 0 for a reef tank but under 20 should be your current goal. Do 20% pwc
's every few days to get it there. Next you need to find the source(s) of your nitrates and eliminate that/those source(s).