In my tanks I do not face the MTS with sand front or sides of the tank. You can see the layers of MTS and sand. You can see the fine particulate matter that settles on the sand work it's way into the substrate.
So yes, it will allow passage of fine matter.
Sold fish waste will desolve over a few days just as it does in nature and be reclaimed into the substrate.
It's up to the individual to decide how offense a pc of fish poop is to view for a day or so.
Last edited by DogFish; 07-10-2012 at 10:14 PM.
Reason: Fat Fingers = Typos