Originally Posted by artur
...I did not check that water like You asked before mixing salt for nitrate.But when i started 4 months ago it was 0.So i think that is not an issue....
That is the same situation I had when I started - I used tap to start with because it tested 0.0 ppm
. But 4 months later it tested 5-10ppm. Tap water is not consistent and just because it test good one month (or day!) doesn't mean it'll test good the next. That's the only reason I asked, because many times people look everywhere for a nitrate source except their source water. At least you tested for it, so that's good.
I'm not going to get into the tap vs. RO
water debate because I think there are just to many variables. But I will say that using DI
water in my tank never makes me wonder if something that's going on in my tank is due to my source water, because it's consistent from batch to batch.
20ppm for corals is not bad... relative to say 200ppm! But compared to most folks that keep corals, I don't think it's good either. For comparison, my nitrates bounce around 1.0ppm. I'd be pulling my hair out if they ever even got close to 5 ppm