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Ken,
I've been using your standpipe design with great success for almost a year now on my 150g. I find that the algae and gunk that would clog the holes usually builds up on the overflow grate instead of the holes in the standpipe. I do periodically check and clean the standpipe's holes though to make sure they're clear of debris. I wish I had a miter saw to create the single square hole that you presently use.
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