diatom bloom

chemicals are a last resort. Maybe you can remove a small portion of the sand where the cyano is located. Now you will need to remove what the fuel for the cyano is.
 
tat, I think to figure out what it is we first need to define algae and cyano. This is difficult as when you do a search on Google you come up with biology-online defining it as a blue-green algae and some other odd definitions. As far as we concerned with our aquariums cyano is actually cyanobacteria. Cyanobacteria I wouldn't define as an algae at all and many people in the hobby just refer to it as red slime.

If it is cyanobacteria then higher flow in that area of the tank may keep it from being as present in large amounts, but as Al said deal with the source first and foremost. It is my understanding, though I haven't heavily researched it, is that cyano feeds off of Nitrites which is a sign that you have a lot of excess ammonia in your system which is not being dealt with properly.

Are you still skimming heavy? You stopped feeding some things you fed before is there any new foods you are feeding? What are you tank levels and what have you changed recently.

Side note your children will live to see the day where jellyfish and cyanobacteria will rule the oceans unless humanity as a whole wakes up and makes a massive change about 50 years ago.
 
You could also try leaving the lights off for about 2 days and then doing a big water change about 2 more after that... if its cyano it should die and then the waterchange helps remove the nutrients.
 
<a href=showthread.php?s=&postid=11846438#post11846438 target=_blank>Originally posted</a> by icy1155
You could also try leaving the lights off for about 2 days and then doing a big water change about 2 more after that... if its cyano it should die and then the waterchange helps remove the nutrients.

Agreed, this works well
 
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