Cedar shingles from Home Depot and what I use. Plenty wide and long just cut off the unused portion and throw away.i have an 180 gallon tank and the floor is not level. floor is about 1/2 inch lower in the front.
my stand legs are about 3 inches wide and most of the shims i found are about 1 inch wide.
i thought of using 2 shims per leg but i feel its dangerous
so where can i find a shim thats 1/2" inch thick and wider that 3 inches ?