i had an xp3 on my 75g and hated it. i dont feel like it was near enough filtration. slow flow even with the powerjet and no filter floss. GOOD filter, but slow as molasses, good for bio.
get a fluval fx5 off ebay for 200 and be done with it, its way more than the 75g needs, but its nice to have that reassurance. not to mention you can use a butload of bio media because of the size of filter, its rated at 900gph, usually get about 500-600gph out of one. thats about an 8x turnover rate. PERFECT for that tank
im using 3m color quartz t grade, for mine and its sucked up plenty, my fish always blows the sand in it out of its mouth, and kicks it up in it. and it hasnt hurt it at all. theres always plenty of sand in the bottom of the fx5 when i clean it out.
if you plan on heavy stocking DO NOT rely just on the xp3, it is NOT enough in my opinion. ive already been that route.
!!!!!!! edit !!!!!!!!
OOPS, guess you posted while i was typing, hope it works out for you!, good luck.