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I have a couple of Aquaclear 70 HOBs on my 60g and have a [pool filter] sand substrate and have never had a sand problem in the filters.
Is your sand too fine so it's easily raised off the bottom or as mentioned, is your intake tube too low/close to the surface of the sand?
Perhaps your sand wasn't rinsed/washed well enough to remove the finer sand particles?
I have a couple of Aquaclear 70 HOBs on my 60g and have a [pool filter] sand substrate and have never had a sand problem in the filters.
Is your sand too fine so it's easily raised off the bottom or as mentioned, is your intake tube too low/close to the surface of the sand?
Perhaps your sand wasn't rinsed/washed well enough to remove the finer sand particles?