Agreed with the above. It depends on how water is getting to the fuge and back out.
My tank drains to the sump and then I have a PH
that takes water from the sump and then that gravity feeds back to the sump. If my main tank pump shuts down, my fuge can stay running with no problems.
Really a fuge does not need baffles. If you have the tank draining into the fuge you will need something to slow the water down a baffle might be needed. You don't want a lot of flow in the fuge.
*180 gal Display, 100 gal basement sump, 33 gal refugium, 3x250 MH, 2x160 VHO actinics, zoos, some softies, LPS & lots of acros and other SPS.
*100 gal prop tank plumbed into main system w/ 2x96 PC lights and 1x150 MH,