It is in medium flow.
At last testing everything in my tank was fine; pH 8.2, temp 79-81, nitrate, nitrite 0, Ca ~380-400ppm, etc.
It has been doing this for a while, probably three or four months. It doesn't seem to adversely affect it, its just strange. All my other sps, lps, clams have shown no indication of anything wrong water wise.
Have you ever seen or heard of this before?
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