Hey All,
I see you are on page 17 so I'm guessing you are still debating the cyano issue and since I don't have the time to read the entire post, here is what I used to do and it works without fail every time.
I would dose my tank with Erythromycin, specifically Aquarium Pharmaceuticals EM Erythromycin Fish Medicine Powder Packets.
Here a link so you can see what it looks like.
http://aquaterras.com/index.php?main...oducts_id=1006
I would buy it at Petland and dose 1 packet per 10g mixed with a little tank water then add to tank. I wouldn't dump the packets right in. TURN OFF YOUR SKIMMER! It works quickly and after a couple days it should be mostly gone. Have a filter sock or something on to catch what goes out your overflow.
I would keep my skimmer off for this time and then do a 25% water change after 2 days. Then another smaller one a few days later. Obviously when I turn my skimmer back on I would have to dial it back, but since I was doing water changes it didn't matter so much.
Once I figured this out I never worried about cyano. I think once its in your tank it never really goes away. I would probably to this once a year or so.
Now of course I'm sure the debate will start so I'll say this. It works and tank was just fine. I learned this trick from Colby at Elite before he rode off into the sunset. I haven't had to do this for awhile since I downsized my tank and have T5s instead of MH lighting so go figure.