I tried to drill the back panal of a 55 gal. tank that I have had for 15+ years, and it blew up like a bomb. The bottom said tempered so I proceded to drill the back. Needless to say I threw the remains away. While breaking up the remains I did find out the two ends of the tank are NOT tempered. After doing some research, I found that all the ends are non-tempered. So if you are going to drill, drill the ends.. Good luck _________  90 gal AGA,main,, 40,gal, sump/refug,aqua ev 120 skimmer, mag-5 pumps x2,, hydor koralia 3 circulations pumps x2,, sunpod 300w MH,, current extreme T5 14,000+super actinic 460,, 110 lb. DSB, 100 lbs. LR |