Sump Baffles

[SeaHorse_Fanatic]

I have mine cut so there is a very small gap, just enough to easily twist the baffle into place. Usually say 3 or 4 mm less than the inside width or 3/16th or so inches. I like it so that with a bead of silicone all the way around, the baffle will be tight enough to stay in place without too much effort while its drying. The most I would do is have a 5 mm difference, but I prefer less myself.