1. don't touch that rock - remember last time it took you 2 hours to put the tank back together?
2. don't touch anything before taking the "post your tank shots here picture". clean the glass thats it. nobody will see that rock out of place.
3. don't touch that rock, touching it equals less real estate when the dust clears. and this happens every time you touch the rock.
4. if you touch that rock, forget the picture. There's so much crud floating in the tank now and your fingers are so pruney they can't work the camera