I got a 30 gallon tank from craigslist today!!! When I brought it home I noticed a couple of surprises. 1. It had a UTH already on it, that is supposed to be in working order, but it covers a little under half the tank so I'm guessing it's a large or medium. Is this too big for a 30 gallon? 2. It came with a light holder that is meant for a 60 watt bulb. Would it be ok to use a 60 watt CHE in it? and 3. It came with an Accurite but it only has one probe on it. I need one with two probes right?