08-24-2011, 04:18 PM
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The skimmer will handle this, but be cautious because small fish will get pulled into it and the force is sufficient that they cannot get out. I lost quite a few dwarf rasbora and even had an Aspidoras jammed in mine, so I disconnected them. You can build a screen covering, but then leaf debris gets trapped and clogs. I have floating plants, I consider them essential in forest fish aquaria, and bits of leaf or duckweed will easily clog a screen.
To answer your other question if it will go away--it may or may not. As I speculated, organics cause this, and organic load in an aquarium can vary from season to season according to extra light (longer days in summer), warmth (summer again) plus varying plant and fish loads/species.
In my former 70g setup it was bad. I siphoned all of it off every week, and i did get all of it, the surface was crystal clear after the weekly water change. But well before the following week, if you looked in the top of the tank from above you could not see through the scum, it was that thick, like a green opaque cover. That tank also had cyanobacteria a lot, organics-related too, hence my assumption. Eventually it cleared, though I pulled the tank down and moved everything around anyway. I now see it very seldom, and usually only in one or two tanks and very, very sparsely then.