Why do they have to complicate a simple device like a gravel cleaner.
Keep the standard gravel cleaner but see if you can find it with a slightly wider diameter tube, and without the squeezy pump part.
https://www.amazon.com/gp/product/B004RK1WBK/?tag=ff0d01-20
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Cancel this because it is useless and does not help. Do not waste your money on this type of gravel cleaner.
https://www.amazon.com/gp/product/B003OYOPNW/?tag=ff0d01-20
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The purpose of a gravel cleaner is to remove the crap from the gravel and the dirty water at the same time. Your 2nd item appears to suck the crap out of the gravel and traps it in a bag but returns the dirty water to the tank. That is not what you want. The gunk that is in the gravel is nasty and needs to be removed completely along with the dirty water. Having it trapped in a bag for a few minutes is going to allow the really fine particles (including harmful pathogens) to come out of the bag and float around the tank with the fish.
Keep the standard gravel cleaner but see if you can find it with a slightly wider diameter tube, and without the squeezy pump part.
https://www.amazon.com/gp/product/B004RK1WBK/?tag=ff0d01-20
--------------------
Cancel this because it is useless and does not help. Do not waste your money on this type of gravel cleaner.
https://www.amazon.com/gp/product/B003OYOPNW/?tag=ff0d01-20
-------------------
The purpose of a gravel cleaner is to remove the crap from the gravel and the dirty water at the same time. Your 2nd item appears to suck the crap out of the gravel and traps it in a bag but returns the dirty water to the tank. That is not what you want. The gunk that is in the gravel is nasty and needs to be removed completely along with the dirty water. Having it trapped in a bag for a few minutes is going to allow the really fine particles (including harmful pathogens) to come out of the bag and float around the tank with the fish.