The thermometer I use is this one: http://www.amazon.com/Marina-Floatin...hu-rd_add_1_dp
so I don't believe it's taking the temp of the outside or plastic.
As for Steve he's currently in the empty half of the 10g. He and Hilda had a bit of a flare off through the divider, which is semi opague, but they're pretty much ignoring each other as of now.
I think he's taking the change better than I am! He likes to watch tv with me at night and I missed that. He literally stays at the front of the tank and stares at my tv while the show is on, especially if it's MLP.
Let's just hope his new filter gets here soon!