I have had this Acropora in my tank since February. It has encrusted and grown well. Color seems fine and polyps are out. I believe it’s a Dan Aykroyd Acro. I’m pretty terrible at remembering names though. Anyway. As you can see from the picture it has a bald spot right in the middle. It’s been there for a couple of months now. It seems like it may be growing but at a very slow barely perceptible rate. Any ideas what would cause this. Alk 8.2 po3 .07.14 No4 15-20 temp 79 salinity 1.025 - 1.026. The bald spot looks like it has a slime coat around it kinda like what a green slimer does when annoyed or handled.
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