water temp & mh lighting

[robzilla]

Originally Posted by Beverly

That's a huge increase in 6 hours, especially since it's not enclosed and is so high off the tank. Is this set up in a smallish room where room temps might be rising as well?

the room is about 9x12, in the basement of our home.
thinking about it, it's probably the floating glass thermometer thats giving the reading of the water at the top only.
do those stick on type thermometers work? any suggestions?