fleece rollermat filtration

I'm will soon purchase a Reefer 525 G2. Total volume [ tank & sump) = 143g. *DT about 112g. Interested in the ReefMat 500 & 1200. Red Sea says 500 is good up up to 130g tank [ and filters up to 1580 gph. 1200 is good up to 300 gal tank with 2580 gph output. My question is after rocks and...