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Is this Cyno?


lavalars

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If it sloughs off easily with a blast from the turkey baster, then it's cyano; if it's hard and not slimy, it's probably coralline. Hard to tell from this distance...

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bluebastion

stating the stated, but if it's the purple stuff on the live rock you're talking about, it's coraline algea... it's the good stuff, except when it starts to grow on you glass/acrylic... even then it's just ugly, not bad.

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Looks like cyano to me, but the pic isn't so good. It's easy to tell the difference, though: coralline algae is tough, looks and feels like thick paint on the rocks. Cyanobacteria is a translucent purple, brown, green, or black film that can be quite thick, snotty-looking, often traps bubbles beneath it, and, as another user mentioned, blows away when blown with a heavy stream of water (turkey baster, etc.) Check out that link, and remember: the best way to treat algae is to treat the cause--overfeeding, too much light, old bulbs, unnecessary dosing, etc.--not the symptom (meaning just trying to get rid of the algae itself, using harsh chemicals, which only causes a constant cycle).

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Sorry, its a bad pic, but its def not coraline. :) My bulbs are new, I probably overfeed, but I just added a fuge so hopefully that will help. ;)

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Try siphoning it out by hand whenever you see it, and if it persists, then you'll want to try chemical means like Chemi-Clean or antibiotics. Do some research--look up cyanobacteria.

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