So I drilled my first tank today. Applied to much pressure and when the drill finally broke through to the other side the drill came crashing down and cracked the glass. The 2nd tank went well. Can I use the cracked tank or is this just asking for problems. I don't think its sharp enough to cut frog toes and I've never seen frogs climb upsided down on the roof of a tank. Is that $1 a gallon sale still going?