Hi, and welcome to RTB!! You will find just about all the answers to any of your questions here, and sometimes answers to things you don't want to know about!! [img]modules/Forum/images/smiles/icon_lol.gif[/img]
When you start talking about heating, you are opening up a very large discussion. What people use varies upon their set-up, location, animal, ventilation, etc.....and the list goes on. Could you please supply some more details? We could answer your question much more accurately then. Until then, here are my 2 cents:
I use both that you have listed, the T-Rex Cobra mat and the Zoo Med. I leave mine on 24 hours a day. I give the temprature variances by turning off my basking lamps at night. Sometimes I give them a black light, but usually not. (Here is where knowing the rep. you are keeping in the tank is helpful...What are THIER requirements?)
You made reference to **above room temperature**. What is your room temperature? What is your home at? Everyone is different...
Here are some helpful questions that would help us answer better;
1. What are you keeping? What are thier temp requirements?
2. What kind of top do you have? I am assuming it is a screen top, as breeder tanks usually are.
3. What is the temperture where the tank is located?
4. Are you using only one
UTH for a 70 breeder? If so, what do you have up top?
5. What are you using for substrate? How deep is it?
As I said at the beginning, these are my 2 cents worth. But, there will be many more here that will agree or disagree with me, or list things that I did not. With all these people putting in their 2 cents, you will be rich soon. (Just an added benefit to being here [img]modules/Forum/images/smiles/icon_lol.gif[/img] [img]modules/Forum/images/smiles/icon_lol.gif[/img] )
Oh, almost forgot. Zoo Med is a
UTH, but the Cobra is a heat mat. It can be placed inside the tank if preferred. They are designed that way, and therefore are much more durable and better sealed.
Once again, welcome and good luck!!!
[addsig]