Sorry about that Bill, I was piecing things together in my head that didn't actually happen.

I've always wondered about in tank pumps, which is why i've been thinking about canister filters. I've had a couple in tank pumps that eventually died, and due to my poor planning, I was unable to remove or fix them without destroying the tank. If I had planned ahead I could have made them accessible and this wouldn't have been a problem. Like I said though, definitely differing to you (Bill) for all of that stuff.

And like pogigod said, I was responding to his aquarium gravel question.

~Alex