I just wanted to run a quick poll. I have used sand in my 55 and in my 29 since I got them. I'm kinda getting tired of it. When I do my water changes the siphon pulls up a bunch of it. It also seems to show everything. Any sediment or fish poop stands out drastically no matter how long I spend vacuuming. I just like the way sand looks. I have white sand in my 29 (bad choice of color) and black and grey sand in my 55. Should I switch to gravel or just make all black substrate?