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Discussion Starter #1
Ok, I thought old bulbs caused cyano??? I finally got around to replacing my year and a half old VHO bulbs. I switched out a bulb every few days. Now I am getting very small patches of cyano. In 3 years of reefing, I have never had cyano. I'm starting to panic.... But, first I am mixing some salt for a water change and will test the water tomorrow. I am assuming this is from the new bulbs?
 

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Got Crabs?
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5,526 Posts
Old bubls do not cause cyano or any other algae for that matter. Abundant nutrients are the main fuel for the fire so to speak.
 

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TCMAS Member
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5,667 Posts
New bulbs could have sparked the onset but nutrients is the root cause. If it isn't bad yet, you may be able to cure it with a water change, however most times when you get cyano, it will take a while for it to die off on it's own so just be patient and deligent with your water quality and keeping the sandbed clean of detritius if possible.
 

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Semi-retar...eh...retired
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2,995 Posts
Agreed. Without nutrients, algae can't grow. Since cyano can fix nitrogen and create its own nitrate, your probably looking at a buildup of dissolved organics as the root cause of the cyano growth. Do you run carbon? Got dirty sand?

BTW, Side Lake eh? :) I was born a Ranger....
 
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