LPS corals receding

[Myka]

Originally Posted by gmann

more what?

Sorry, more nitrate...auto correct typo. Get a better NO3 kit to conform your testing - I like Salifert or Red Sea Pro.

CUC: couple of trochus snails, there should be some nassarius in there, and 4-5 zebra hermits
- lights: 3 x kessil 360, running from 2pm to 9pm
- supplement with 2 x t5 (coral plus & blue plus) from 4pm-8pm

Lighting looks fine. Your CUC is sadly lacking. I'm betting if you added a bunch of CUC the algae would get eaten and not come back as long as the CUC is alive still.

You said 60 gallons is about 25% wc, so your tank is probably a 180 or 230 depending on sump?? If so, I'd suggest 10 Trochus (15 if they are small) and 20 Scarlet Hermits (not other types) to start. See where that gets you - you may need quite a bit more.

vacuum gravel yes, basting rocks, not so much

Basting is one of the best ways to help combat an algae problem.

I missed that 37 ppt...that's walking the edge of safety and if your calibration is off this could easily become 30 ppt which could cerainly kill your corals on its own. Natural seawater is typically 35 ppt and there is no reason to aim for any other number in a reef tank. Make sure you calibrate with a SEAWATER calibration solution (not sodium chloride solution, not ro water).