Why have teeth in baffles of sump?

Chappy

Member
I'm making my own sump for a 180 and am wondering why have teeth routed in the baffles? I noticed in the bubble traps there are no teeth, but the refugium does have teeth. Is it to keep snails or macro from getting into the return?
 
exactly. It does put the water level below the top of the overflow to discourage creatures from taking a ride.
 
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