Is this Cyno

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Hi Guys, recently started a bb tank about 9 weeks ago. Parameters are pretty good (had them checked last weekend) phosphates were nearly 0. Is this the dreaded Cyno?

20170915_184222.jpg
 
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Looks like it. Did you not notice any cyano during the cycle? If not, were your lights on during the cycle?

I also recently started up a 30 gallon and let it cycle. All parameters were good, but my lights were off during the cycle. During the first week that the lights were on I noticed the cyano start growing on the surface of my rocks. This may be the cause as in your case.

What I did to try and reduce any impact this would have on current livestock:
-Reduce feeding
-Reduce lighting time to about 6 hours
-Weekly water changes of about 30%
-Added some phosphate remover to my filter media
-Try and siphon some off during water changes but do not brush as it will help spread
 
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Lights were on during my cycle.

I'm not feeding at all.

Apparently Chemiclean works wonders. May give it a try
 
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Let it run its course, a tank is not even fully cycled after a year. May just require more time to establish fully and naturally sort out phosphates.
 

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