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While on the subject, this is something that I have recently been experiencing in my tank. I have never experienced anything like this before, ever, call me lucky. I have a 20L reef that has been up for about 6 years now. I just recently moved the tank and also I mounted the light about 3" closer than it was prior to the move.
Over the past two months, I have observed my coraline turn to a pale yellow color. I know it might have something to do with the light because it only has changed color where the light currently shines. In the shadows, the coraline looks healthy as can be. At the same time I replaced a year-old bulb with a new one.
Also, there are quite a few species of coraline on my rocks (deep red, smooth dark purple, chalky pastel purple, etc.) and the only species that seems to be turning yellow is the "chalky pastel purple". Even though the other species of coraline are also directly exposed to the light, they are unaffected.
Any advise? Thanks in advance!
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- Justin
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