One of my acros has slow tissue lost, not rapid like RTN. Happening very slowly over a matter of a week or two on the tips. Its been in my tank for 2 months now. It's next to another colony doing well.
There are a few reasons for this... usually. Organic carbon dosing - you use any vinegar/vodka/sugar or bio pellets? Hot spots in LEDs. Too high or too low of N nitrate and phosphate.
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