Marie, if you are still having troubles with your coraline plugging up the slots on your overflow, just try lowering your water for a couple of hours or so. Corraline doesnt last too long when exposed to air. This is what I do and it seams to keep the corraline away for longer when its all dead for 1/2 " or so around the slots. Whenever I scrape i enivitibly leave a few little pieces behind that regrow quite quickly.
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