What vacuum should I get?

What siphon/vacuum would be good for a 20g high tank? I looked on amazon and there are too many options!
depends on substrate
if it is gravel id just go for a reliable one
if it is sand id go for fancy one
 
Just get a basic model like the one in the following link

that one from amazon should be fine
Size: 2.00 x 7.00 x 17.00
thank you!
 

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