SunSun $$ vs Sump $$$ on the 125
Sump just seems easier in the long run for the 180.
I just cleaned my easy to clean Marineland Magnum 350 that I'd let go too long. Major PITA as the inner media canister was crushed due to the high suck in pressure. At least we know the mag pump is a good one. I disassembled it and took that plastic screen under hot water to soften it up enough to roll up and straighten out the huge cave in dents LOL.
I wouldn't have had to do that with a sump.