Hydnophora bleaching / losing polyps fast

nautilus808

New member
I have 2 types of hydno in my 13 gallon. One was sold to me as a "bushy hydno " and the other is the more common hydno. I just noticed that they both have areas of recently exposed , white skeleton with no tissue . All parameters are fine but with 10 ppm nO3. I have been using 2 65 watt power compacts for light . Could this be a lighting issue. The areas that lost tissue are predominately "under the brances" areas. Perhaps theese areas did not get enough light or flow? Please help.
 
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