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Don’t see bleaching signals. Why do you say that?
I would agree, that part of the coral is looking more bleached than growth IMO. I wouldn't really stress on it yet. If it becomes worse maybe lower the light intensity some and see if that helps.Lower left area seems more pale/whiteish
My orange monti will take a blasting and ask for more. If they don’t get enough light they will also loose color and turn white.
It’s 8” from the top. Ai prime HD is ~11” off the water.
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This isn't bleaching. This is a nutrient issue, you either have low trace elements or low nutrients and the coral is going pale due to starvation. Bleaching is typically on parts closest to the light and looks very white. My monti's due this when I don't add trace elements, usually once I get back on schedule they color right back up.
Monti's are very hardy corals that can and will grow like weeds. I can tell you 100% you're not bleaching them and would probably not be able to if you tried. It looks like your zoa's may be extending a little bit for more light...even more proof your monti is getting nowhere near enough to bleach.
19" away from a prime I would bet that's getting under 280 par.
What's your water change schedule and do you dose anything to the tank?
No3? Po4?
I would say no. Looks like it's growing in that area and thus the lighter color.
I've seen red monti caps start to pale like that when they weren't getting enough light.
Definitely lack of nutrients. 0 NO3 and 0.02 PO4 it’s not good for them. I would try to get some more NO3. Personally I like to have NO3 between 1-5
They will have a light color but it is only at the leading edge as they grow out; the picture above looks like it's pale about 1" in from the growing edge. This isnt consistent with growth.
They can tolerate very low light without getting pale (well under 100 PAR). At 250 PAR mine bleaches from too much light so you certainly cant blast them either. This may be due to lighting but I'm not sure.
Unlikely
Older growth can have darker coloration, newer growth can have lighter coloration. Very light coloration at the perimeter edges is rapid growth.
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Mine has all of those characteristics.
+1 on this. My montis have grown in very low light before. Especially when they scroll over themselves, they get seem to get a darker red lower light. In high light they get very bright almost pinkish/red.They can tolerate very low light without getting pale (well under 100 PAR). At 250 PAR mine bleaches from too much light so you certainly cant blast them either. This may be due to lighting but I'm not sure.

