i agree. YOu can get rid of the undergravel filter that way. I dont like those, i used to use them years ago when i first started and i personally feel that they are just bad bacteria traps. I cant stand them now LOL. I actually find sand is cleaner, debris sits on top and is easily removed compared to gravel that seems to trap the gunk down inside the gravel bed. Sand is easy to vacume once you do it a couple times, just barely run the vacume across the surface and its clean, if you suck up the sand just lightly bang it on a rock and it comes right back out like the gravel does. I have black sand in one tank and white sand in another. THe white sand i actually mixed some fine gravel into and i find the gravel helps to make the debris not noticable , that tank always looks clean even if i fall behind in my maintenance and dont vacume it for a long time. Looks very natural too. The fish do a lot of digging in that tank compared to the one with no gravel, i think its the bits they get to spit out, makes them feel more productive LOL