So I have a stupid question... or a series of stupid questions.. A tank I just got came with a thermometer strip on the side of it so I was wondering; 1 - Are They accurate? 2- How do you read them? I'm looking at it right now, and theres 5 different temperatures lite up. (75,77 dark blue, 79 turquoise, 81 brown, 82 kind of an olive green.) I'm Lost... 3- Do they wear out? 4- If I just take it off, will it leave a residue on my tank? what could be safely used to remove any residue thats left behind?? Thanks a lot for any help!