I have done this rinse is well sift it if you want then add a lil at a time. do it in like 12 inch sections of your tank if you don't try to overload the system to much you should be fine but I do suggest sifting the sand and discarding all the fine fine sludge
what size are you planninf to cut I have cut 3/8 inch glass on my kitchen table with no issues let me know what your planning and I can help you I think
dude I have a 40 breeder with the nova extreme pro lights and I could not be more happy IMO I think you would be disappointed if you went with anything but them after a month or so you will want to get new bulbs as the current bulbs are junk go with the UVB bulbs of one of the other higher end bulbs