So Genesis is on his second day in his new tank. He spent both days rather clamped, and either resting under the filter (it's off), or on the bottom in a corner. He'd only move between those 2 spots, and to go up to eat/get air.
Well, today, I watched him ram the floating thermometer I had pressed against the tank fairly hard (enough to push it away from the side of the tank), and then proceeded to flare at it.
I took it out about 5 minutes ago, and he's swimming around now, checking out the mug I put in for him, checking out his plants, and he's already unclamped a little bit.
...Was my silly little boy afraid of his thermometer