As far as the weir - unless you feed something like larger shrimp there should be no problems with clogging, the slots are usually 1/4" wide.
You can also use a weir with no teeth under the water level by around 1/4".
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250 gallon mixed reef, 2 Reefbreeder's Photon V 2, Deepwater BLDC 12, DAS EX-3 Skimmer, MTC mini cal, 2-3/4" Sea Swirls, Aquacontroller & 6 Tunze pumps.
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