What is this dark brown/black sludge on live rock? - Tropical Fish Keeping - Aquarium fish care and resources
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post #1 of 4 Old 03-14-2015, 10:02 PM Thread Starter
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What is this dark brown/black sludge on live rock?

Theres this dark brown/black sludge on my live rock.. It looks fuzzy, like mold, and it appears in small patches around the rock. It seems to have gotten worse since i upgraded my lighting. The tank is about 4 months old so algae blooms are to be expected but this looks different thsn most of my algae
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post #2 of 4 Old 03-16-2015, 02:02 AM
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Is it rough to the touch or soft and slimy? Does it rub away or is it held to the rock?

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post #3 of 4 Old 03-29-2015, 03:56 PM Thread Starter
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It's hard to say, but it comes away from the rock pretty easily. I tried scraping it off and it detached right away, however it spread to all of the surrounding rock. Thinking it's cyano.
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post #4 of 4 Old 03-29-2015, 08:40 PM
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If it is cyano then nutrient export, added flow, and possibly revamping the clean up crew... and if all else fails chemi clean.

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