DOC Skimmer / magnet

I see there are two types of magnets depending on thickness of glass. I have an AG 90 gallon tank. Which one would I need?

Thanks
 
The 6080.50 is for 1/2" or less, that is what you would want. The 6200.50 is for 1/2" to 3/4" or very heavy items like the calcium reactor or bio reactor.
 
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