Don't you just love talking to idiots?

--
Christopher A. Young
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wrote in message

Clean OK, but the gravel must be cleaned itself as gravel is dirty,
either way he has a mucky mess, gravel would scour the walls

Before you post anything that makes even less sense than that, please
go back and carefully read what I wrote. I specified CLEAN gravel.

And yes, the gravel will scour the walls, removing all the gunk and
the rust that is sure to be present. That's the whole point of
CLEANING THE TANK.