Really? You can be so certain about something like that? You happen to know everything that could be in that screw?
We all know what rust is and most of the time won't cause issues but we are NEVER that certain. I remember someone on here finding a razor blade hidden in their sand and all their issues went away when they removed it.
But they purposely sink old ships because reefs thrive around them.
So we never know. We are never that certain in this hobby.
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The rust isnt just off the screws its off the body of the pump. There was nothing in my sand the first time or the second time I changed it. The only metal things in the tank were the mag 12 and a mag 9.5.
With the sinking of ships your talking 1 ship 100 feet long to an ocean of millons of gallons. And god doing the water changes and alk and cal tests.
So one said it right to me once we are trying to keep the ocean that god made in a glass tank... And we arent god.....
Good luck in the hobby and hope you are never faced with the problems I had.