I just wanted to let you know that i just converted my 20 gallon long tank into an upright tank for my white tree frog and i have only had her in it for just over 3 weeks, I love it but i had the heat lamp up off the glass about 3-4 inches just like i was told and the glass is now cracked. I am so made cause i have payed all the money and time to do this and now i am putting her back into a small tank until i can figure something out.