03-07-2013, 07:02 PM
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Mikey, is what you had the same as what is showing in the photo Aurie posted? Because that is cyanobacteria. It is slimy, easily comes off with your fingers, will stain your fingers and anything else green, etc. In my tank is was much brighter green, but cyano can be red, green, almost black, or anything between.
You will have better results when the plants are fuller; right now they are minimal so not doing a lot with respect to nutrients/organics.
And here I must mention the soil. This is usually a high source of organics, depending upon where it came from. It would not surprise me at all if the cyano is due to the soil leeching organics into the water. Not suggesting pulling it out, but only pointing out this likely source. Again, more plants or increased plant growth should help.
I would reduce the light duration down to 8 hours daily. I would also increase the water changes to at least half the tank volume once weekly. The issue with both suggestions is to limit the light and organics to prevent cyano from taking hold. There has to be a balance, and clearly this is not occurring (assuming cyano is the issue).