It's not really in a spot where I can see the underside of it. I just pulled about a 1 square inch piece off the worst area, and the underside is clean as a whistle.What your describing sounds exactly like MEN. They can be very tiny and not visible with the naked eye. The damage starts slow and it may be on just one montipora but as the population grows they will eventually spread to others. You need to check on the underside near the edges of new tissue. I used my cellphone with max zoom to spot and observe my infection. Eventually they will grow larger and more populous. These things are a real ***** to get rid of. I had success with Potassium Permanganate. This is some pretty deadly stuff and you don't want it anywhere near your tank. I used a 1.5 hour dip then rinse three times. I lost about 80% of my monti's but managed to save a few. Been about two months since I've seen one of those little devils. The PP kills the nudi's and their eggs.
Spend 50$ and do the triton test.throw out the reef breaders. And feed frozen.
I had photon 16. Couldn't grow anything but mushrooms. I had a sunset monti that lost all of its color, turned greyTried all sorts of programs. Nothing would work. Actually that was the only sps that could survive the reef breeders. I lost a lot of frags using those thing.
First i added t5s the growth and color returned like nothing i got form the reef breeders.
I have since added kessil a360 and am growing sps.
Tried everything, and in the end it was the lights.
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I would lay of the carbon dosing and up your feedings.
I haven't actually started carbon dosing. I just wanted to get the new salt with the intent of eventually starting.