I have the Seaflor special grade reef. I know there's another seaflor that is pretty much shells and other huge bits, but this stuff is a good chunk heavier than the sand I usually use. Which one are you refering to?

Also, for reference, I do have an MP40 that I've been using for close to a year now. I don't mind the noise at all and think most of the claims are exagerrated, or improper alignment.

I guess as soon as I have a chance, I'll try the MP40 that close to the sand and see what the result is.