I would cut baffles and wrap the 3 sides with foam or filter floss, etc. to wedge them in place. I have done this before, and it works well until the next time you have your sump apart to silicone them. It is also a great way to experiment with the baffle placement.
If you have any eggcrate, you can use it as spacers and glue the 3 baffles together (spaced evenly with the eggcrate spacers) and drop the whole unit into your sump and drop a rock, etc. behind it to stop it from moving.
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90gal Starfire mixed reef, 400W MH (Giesemann 13K megachrome/Icecap E-ballast), (2) 54W T5 Giesemann true actinic, 45gal sump (65W 50/50 PC), ASM G-3 Skimmer, Mak 4 return, Sequence Dart closed loop, foam backdrop, 120 lbs LR, 2" sandbed, & 1 dillhole running the show.
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