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You don't want "slots" for an overflow. This has to be one of the most useless "fads" or "trends" in reef keeping. The only time slots are usefull is when the linear overflow length is to short and the water going over the falls is 1/4" or more deep. Making a wider overflow is the solution, then teeth will not be needed to keep critters out.
ANy time you add teeth, you diminish the surface skimming ability of the overflow. If it is already to narrow and teeth are needed to keep out the critters, then all the teeth will do is make that much worse! In conlcusion, teeth should nerver be used, as they defeat ther purpose of a linear style overflow.
Bean
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