rallysman said:If your python tube is long enough, it wont suck it up...if it does you can always try to turn the water pressure down to reduce the suction. I have sand in mine, with a catfish that LOVES to stir it up, it always just settles right back down, never cloudy. If your sand happened to get into the imppellers it would probably make it noisy and screw it up....but you will be fine unless you have some diggers. What are you planning on having in this tank, and how far will the filter intake be from the sand?
I'm planning on sticking my arowana in a 125gal by about decmeber or january. And, I'm trying not to spend a fortune in the process. So, instead of a drilled tank with a wet/dry, I'm getting a standard ank and putting two E400's on the back of it. The pick up for those filters sits pretty low unless you cut the tube. That's why I was worried about sand getting pulled into the filter.