Originally posted by laudluvr
Ok, now what is the source of the problem? Is it any one thing or multiple things?
Landluvr--this was posted by SammyStingray recently on another thread. Do a quick search of this forum and you will come up with tons of info on the subject. He states it well and so does another post written by SPSfreak100 which is written from a different angle in the same thread.
SammyStingray writes:
Water movement is the number one factor in my opinion......cyanobacteria simply has a VERY hard time staying alive in oxygen rich water with good flow. Cyano must reach anaerobic levels to live ......AKA "the almost complete lack of oxygen". Good water movement also has a VERY negative effect on hair algae as well. Tanks with high oxygen levels usually require several (not one or two) powerheads strategically placed........algaes give off oxygen as waste...... they don't like it.
I use two over the back filter that have no media or filters, just empty for surface movement at 400 GPH each (I like these because although the tubes may be considered unsightly, they draw water from behind the rocks and circulate it to the top), two powerheads midway down at 400 GPH each, one across the substrate at 300 GPH, but it doesn't seem like it, and I use an add-on piece to keep it slightly above the sand so it doesn't blow, and finally a mag return pump at around 700 gallons per hour blowing behind the rocks. At best I get a green dusting on the glass, but no hair algae to speak of, and no cyano at all. I haven't even seen a snail on a rock in over a year, and still nothing really.
Nutrient pockets from waste and food falling to the substrate seems to be an issue in many tanks with cyano....mostly because it takes a lot of effort to get water movement on the sand without it blowing everywhere, but good live sand with tons of critters that live off this stuff, and good flow so that everything doesn't just settle on the sand makes a big difference. Just my thoughts......algae hates good flow with plenty of oxygen, but everything else loves it..........the zooxanthellae algae that lives in coral and anemone tissue lives there for good reason.......it doesn't have to deal with high oxygen.....
Cyano bacteria lives inside of just about every land and water "plant" on earth, comes in many colors, and is the oldest living organism ever found on earth......many think it was the very first life on earth, but it doesn't have to live on your sand. Check it out while you do have it......it is the oldest lifeform ever found to exist on planet earth.......kind of cool to look at it and know that.