Who Gives A Fish Forums

Have you checked your water parameters to ensure everything is in line? I've noticed my Acan corals are particularly sensitive to low Alkalinity and low Magnesium levels. With my large Derasa clam and recent Maxima addition, they're putting a strain on my parameters. After correcting the imbalance ...

I also don't target feed my corals, and I've found that when my alkalinity levels drop, I start to see issues similar to what you're experiencing. With your 5-gallon weekly water changes, it's possible that your core parameters - calcium, alkalinity, and magnesium - aren't being replenished to NSW ...