Loosing large SPS colonies

[Werbo]

Originally Posted by Craigdillman

i know u said water is stable but post ur parameters is nitrate or phosphate up at all ? Alk swings can cause this, nitrates can cause some colonies to be stressed and others look fine

I've never tested nitrates in 10+ years. Gonna start testing nitrates when Hanna releases a handheld colorimeter if it's affordable.

Phosphates are .06 on a Hanna. This is low for my tank as po4 is usually .08-.10 in my tank over the last 4 years.