What is this fuzzy stuff, and how to get rid of it? It may be the same stuff that led
to the green slime infestation the aquarium had until a couple months ago when I cut off the lights for a few weeks, cleaned the filter, and did about 80% water change. It seemed to do the trick. Is this what it would look like before green slime? How can I get rid of it more permanently? I hope to not have to cut out the lights, or to go to plastic plants.