Snails and urchin dying off, sps turning black

[JenkinsThePole]

Just tested the nitrates and they're hanging between .2 and .5ppm according to my kit. My DI resin is color changing and it looks fine. My city doesn't add cholramine to the water but my carbon blocks could take out most of it even if it did according to the BRS website. I will up the flow a bit to see if that helps.

 

[JenkinsThePole]

I think I figured out some of the problem. I tested a batch of fresh saltwater and got Ca-560 and KH- 10. I feel like somethings not right lol.

 

[HBtank]

Refrac calibrated? High parameters in fresh salt can be from that.

Edit: Actually you use Reef Crystals, those numbers seem OK for it. High CA and KH are expected with RC, the CA is a bit higher and KH lower than typical, but it can vary with mixes and tests.

 

[JenkinsThePole]

I recalibrate it every few uses so I think thats good. Could high calcium cause my cyphastrea to stress a bit? and is there any good way to bring it down?