I've only one betta (for now), but my betta seems rather fond of his thermometer in his tank. I keep the thermometer off to the side, in a corner of the tank so I can view his beauty. Much to my dismay, he's mostly smooshed against the corner cuddled with the thermometer. Often times the tank looks empty except for that one corner lol. He's more protective of this thermometer than his bubble nest, flaring at me if I threaten to move it. He will "hug" the thermometer by swimming around the glass barrel upwards until he stops in the corner to rest.
Hahahaha my Jackson does this too!!
I have a few weirdo stories about Jackson too:
1) The first night I brought him home, I acclimatized him and then plopped him into his 12 gal. temp. tank. I think I gave the guy a mini heart attack
He had, up to this point, lived in relatively small areas, I guess, so when he saw the vast amount of space he was just like
I swear, he had a mini panic attack, and quickly swam to a corner. He stayed there until he finally plucked up the courage to go explore the areas... he wouldn't go anywhere near the coffee mug I put in (as a hiding place) until day 3 when he finally decided that it wasn't evil.
2) He tries to fight the dropper that we use to test the water parameters lol. Every time he sees it he swims over and chases after it like "You get away from my home! Stop stealing my water!!" My boyfriend has blow water in his face using it, and he usually shakes it off almost like a dog and comes back to chase after it some more lol!
3) The first time I fed him wingless fruit flies, he had no clue what to do with them lol. He would float up towards them and watch them, but never eat them... luckily he eats them now, but it's like he finds it amusing watching them struggle in the water >_<
4) I've had bettas before and they've all made like... one bubble nest at a time... well the other week this guy made TWO. One on each corner... lol!