I'm wondering how accurate a stick-on thermometer is. Probably not as accurate as the ones right in the tank, but I'm considering one. One of my bettas sees himself in the thermometer, and he is always over there, looking at himself, moving his eyes up and down, "kissing" the thermometer, and getting himself all worked up. He's on top of it right now, looking down on it! He'll flare at himself, them he'll fly all around the tank, stop, flare again, etc.....then he catches the attention of his "brother" in the other tank, and gets him flaring too. It's been about 2 weeks, and he hasn't stopped yet! So, would a stick-on thermometer stop the antics of this crazy betta, and be somewhat accurate too?? Petsmart has a Tetra brand one for 99 cents. It's small, though -- not a lot of surface area. Would a bigger one be better?