indeed.
if your tank is at the proper water level, you will not really hear the water exiting the slide.
the other option is to go with a canister, and place the spraybar below the waters surface. however, if your problem is that you are not keeping the water at the proper level, this will not help much either. as the water evaporates, the spraybar will become exposed and create noise.

bestr bet is just maintain your water level.

stay away from internal filters. theyre good for water movement, but not for actual filtration.

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why buy, when you can DIY