Thanks for the explanation...actually is very helpful for me...totally off the target but thanks.
No worries man. I can't say if that's the reason most go to 40's, but I believe that is the max thickness. I'm switching bc I'm going bare bottom now. The mp10s on my tank didn't pick up sand. However the 40's did. I don't want to run my 10s above 75% which I have to do(4ft tank). I rather just get 40s and run them lower.