Why would it be recommended to change all or part of it out at all, if it could cope all that the tank produces for waste ?.....because it just doesnt.
If the sandbed werent there or just minimal, the skimmer or other filtration would have a chance to take up the extra,and siphoning of detritus could be handled easily if any remained on the bottom.
There is no question, it is a sink.
One should also consider is that the sandbed does contain huge amounts of life...could part of the reason for problems stem from die off of some of this life ?
I sort of look at it like a time bomb sitting under my rock waiting to go off.
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Confucious say : Things that come to those who wait, will be things left over by those who didnt.
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