i live in Laredo,TX its in the bottom of texas, its kinda small, it really sux here, but its the biggest import in tx (i think). but even tho ppl make a big deal about it, it really sux here and it hard to find things that you need. ive read a lot of places saying not to use heat rocks but the stores here keep insisting to use the rock. im going to order a heat pad online, but which is the best to get, where can i get it, and where should it be under or in the bottom of the tank. thx for all the help