Last wednesday, we went on a 3 day trip, came home and my hose from the return pump had come off and the pump was sloshing water around the sump. In the DT, the ph's and skimmer were still running. Got everything fixed and this morning, some of the coralline algae has turned white. It's on one side of the tank and is mainly on one rock. My levels are 450 calc, 11dkh,sg
1.024, phos 0, nitrate 10 or less, ph 8.3. Nothing changed except the sg
from no top off, when I got everything hooked back up and let it run the sg
was 1.026. Slowly topped off to 1.024. My lights are on timers and none of my coral has shown any problems. Before leaving, I picked up a pincushion urchin, could that have something to do with it. He is around the area of concern.