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Is that side being shaded? Also what are your parameters? We need more info about your system before anyone can diagnose anything
Kinda looks like lighter coloring from new growth, is the flesh missing or just colored different. A little clearer pic would help a lot to make sure.
That makes it look like missing flesh.
Calcium combines with low alk could be a problem...also, what lighting are you using
This is tissue necrosis, not bleaching.
This is tissue necrosis, not bleaching.
Do you get ICP tests. One may be in order to help solve this

