Waiting to see some pictures, as I want to make the change on the 135 to sand. I saw cashinc25 tanks in person and really liked the look of it, so I'm subscribing to the thread.
Thanks again for giving your opinions. I'm definately leaning towards the black for a couple of reasons. One was because of how awesome it made the fishes' colors in the 55. Two is because of what I'll have to do with the natural river sand. Boiling/baking/microwaving 200 pounds of sand is starting to look like more work than I'd like to put in.
I'm still looking for pics of big tanks with black sand though. So someone post some up. Thanks again for looking.