First off you'll need a bunch more rocks/caves for hiding places if they're getting bullied. The first fish will claim the tank as his own and will defend it when new fish are introduced. If you put the rest of your fish in at once it should help, the first one won't be able to zero in on one particular fish so the agression will be spread out among the others. How many fish do you have? How big is your tank (I'm guessing 20-29) and filter? If you add your extra rocks and rearrange the tank when you put the rest of the fish in that would also help. Makes everyone stake new territory.
The thermometer should be fine. Not to say that it couldn't break, but they can take a beating. If it breaks I don't think the fluid would harm your fish (someone help me on that one), I know its not mercury. I'm sure more people that know more than myself will chime in to help also
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Edit: Can you spot the fish?
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Right side in the plant?