How to attach a thermometer tube in the aquarium?

Some new aquaculture aquaponics Tip: question mrairplaneman777 : How to attach a thermometer tube in the aquarium I have a thermometer that I got at Wal-Mart. 1 of those "aquaculture" thermometer in a tube with weights on the bottom side and a suction cup on leading. But I have this thermometer for ages three +, and the suction cup is made of rubber had any challenging and stuff, and it finally broke. How do I insert the thermometer in my tank with no anything horrible or fantastic? Do I

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