Originally Posted by xfatdannx
So really, once my fish move to the other tank it would probably be easier for me to tear down a re-cycle it.
i've been keeping my filter on high, its rated for up to a 20g and its only a 6 gal tank. I am running lights no more than 8 hours a day. I reduced feeding to every other day. I don't know what else to do to "keep the tank clean enough to drink"
Reading back through this thread, it seems the initial issue was the lights on 24/7 and a buildup of nutrients. This clearly affected the biological balance, and that can take time to re-establish. The only successful way to do this is by targetting the source of the cyano--organics--and then letting the biological balance build properly. This is why I oppose any "quick-fix" which is at best only temporary.
I don't think more water movement has much to do with cyano. I have had it bad right at the filter return.
Not sure what else I can suggest. When i saw this in my 70g, I stopped fertilizing the plants, did a good 50-60% water change every week, deeply vacuuming into the substrate, and manually removing as much of the cyano as I could. It would begin returning a couple days later, so next week the same process. Went like this for 3 months, maybe 4. Then one week, none returned. About 2 months later, it did, so back to the same process, and in another month or two, gone, never to return. I've still no real idea as to why this happened only in this one of seven tanks; it was not heavily stocked with fish either. Temperature was high though, 80F (for the Chocolate Gourami), and I had crypts; I have read that these are commonly related.