What type of thermometers can you get?
• Only use aquarium safe thermometers.
• Some are tubes stuck to the front glass or sump.
• Some float in the tank attached to a hydrometer.
• Some are a sticker that sticks on the front glass of the tank (I avoid these because they take the outside glass temperature not the tank water temperature).
• There are electric thermometers that run a probe into the water.
• Mercury thermometers are more effective but are toxic if broken.

What happens if the thermometer breaks in the tank?
If it is an aquarium thermometer you are safe and it shouldn’t be a problem, you may just have to siphon off any mess.

by Paul Talbot