Which magnet for 120G AGA tank?

[carb850]

I don't know the glass thickness of the 120G tank, so I wanted to know which magnet I should use with my Tunze?

Thanks.

 

[wartskin]

I personally would go with the the 6200.50, better to have it and not need it than to need it and not have it. This will also give you the ability to move to another tank should you ever decide to upgrade.