Another newbie, thinking ahead

[wnateg]

Thanks for the link. For that type of unit do you leave it sitting on the substrate or do you velcro it or attach it some other way to the glass? I would assume something like that sitting on the ground would be knocked over a lot. I had seen some like that Accurite with the probe that goes in the tank and the display sits outside. I didn't know if one was better or if was just a matter of preference.

It's just preference. It does get knocked over a lot. I'd just look on amazon and find something with good reviews that you like.