this has only been in my 5g for about 2 months. its been established for 2 years. at first i thought it was algae but now i think it may not be. i think i started accidentally carbon dosing after rinsing my jugs with vinegar. maybe i didn't get all if the vinegar out. some of what you see is scraped from the glass but also see some stringy stuff. all of the coral is terribly upset. ... doing frequent water changes with properly rinsed jugs.
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