02-03-2013, 07:27 PM
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Yes, that is cyanobacteria. This is actually a bacteria, not a true algae, but most of us lump it in with algae though cause and treatment are a bit different.
Organics cause cyano, in the presence of light. Regular partial water changes including a good vacuum of the substrate should help control organics; also not overfeeding and not overstocking the tank.
Temporary "fixes" like blackouts and removing the sheets of slimy cyano will almost always not be successful in eliminating it, as it will return if the organics are not brought down under control. Treatment with antibiotics while usually successful (it is after all a bacteria) is not recommended; first, these usually kill good bacteria, and some plants, second, fish should not be exposed to antibiotics without very good reason (to cure the fish), third it will return if the tank is not rid of excess organics.
I have had this outbreak a couple times in one particular tank, and I got it under control by vacuuming the substrate well at the weekly water change when I also changed half or more of the water. It took several weeks, but finally it disappeared. It is interesting how it has only ever shown up in one or two specific tanks, never in the others. I haven't had it anywhere now for over a year.
In this case here, I would do a thorough cleaning; remove it with your fingers from plant leaves, wood, rock, decor as best you can just prior to the water change. It will sink to the substrate. Then during the water change, vacuum every inch of the substrate well, picking all of it up. Be minimal in feeding the fish. I reduced my twice weekly liquid plant fert to only once for the weeks needed until this was gone. Some may still reform, so next week do the same thorough cleaning.