Time to quit.

Try Chemiclean. I used it 3 weeks ago and my tank is still, happily cyano free.

 

Hey, thanks for the response. I have a 55 gallon and use ro from a lfs. I do run both carbon and gfo in separate two little fishies reactor, about a cup of gfo in which is currently prolly a month old. My goals with carbon dosing is to get my nutrients as low as possible to get good coral growth, clean tank and water with a white substrate. Something I have seen at my lfs and this is what the owner recommended me to do. He swears by it. He also is the one telling me the cyano is a part of the process and to keep up the dosing and it will go away. But, I have read everywhere that when cyano hits you pick up the mb dosing but lower or stop the vodka due to the fact it will promote the cyano. So, you can see my frustration! Now I am in the middle of cyano all over the place and not sure what to do. Oh, I have an euroreef. Rated for a 90 gallon I believe.

 

A cup of GFO should be sufficient. How much is the euroreef pulling? Should be filling up the collection cup at least once a week. The RO from the LFS could also be a problem. If the tds isn't 0, it probably has phosphate as PO4 is one of the first things to start leaking through a filter. LFSs arn't notoriously good about their filter maintenance. Carbon sources can drive cyano, but not usually if PO4 sufficiently low. I'd start by swaping out the GFO bi-weekly instead of monthly and also do 15% weekly water changes, but try a different source of water. Run carbon, change out often, wet skim, increase flow, siphon out any visible cyano. You should start seeing some improvement in a few weeks (or sooner). If you don't you could try cutting back on the biofuel.

Also as a side note, make sure your GFO isn't leaking into your tank somehow. If the flow rate through the reactor is too high for example, this could pulverize some and it will get into the tank. It's known that cyano is a very effective iron scavenger. If the iron has phosphate bound to it, I believe that cyano may be able to use this whereas it in not biologically available to other organisms.

I'm not a fan of chemicals. There is more chance of the chemicical harming your livestock than the cyano and it does nothing for the underlying cause. If you find and correct the underlying cause and remove the cyano manually, it will also go away.

 

awesome. thanks. i will use these guidelines =)

 

I clean my skimmer every 3 days. Its about half full at that time. And i have just enough flow going through it to "dance" on the surface.