I’ve noticed a couple dark spots on a few heads of the candy cane coral- and Wasn’t sure if it’s something to be concerned about. All the parameters are in my normal range, the tank is about 3 months old and I’ve had this in my tank for about 1.5-2 months now. I’ve been having a little diatom algae show up here and there on the glass and sand (nothing crazy) and I usually clean it within a couple days. It’s a Biocube 32 and I do a 5 gallon water change (reef crystals) about every 4-7 days. So I wasn’t sure if it’s diatoms showing up on the heads or if it’s stressed or dying.
All inputs appreciated