well... i think i was about as far off from the size of the bulkheads as i could be... i judged the size, because the tubing on that tank wouldnt fit on my 3/4" bulkhead for my 20 gallon, it was just a bit to small... so i just realized that there is adapters and such, but i took some pvc off, and got right to the bulkhead which measured 1.25" from inside edge to inside edge... ...woops

thanks caferacermike for the info on how to make a larger pipe, it will probably come i handy in the future