Anything under your reef will likely have turned to rock/coral by now, mine
did, except for the stuff close to the glass which has been frequently
stirred up.

Andy

"david" wrote in message
...
im not trying to sterlize my tank. But is there any method for cleaning
sand
not that it even looks dirty but after a few years should anything be
done.
I want to add more sand and I was wondering if i should do anything first.

not ending in a "You Should Have Done This First" after the event ??

Regards David