You can use repticarpet - it will smell if you dont clean it. I beleive most who use that have 2-3 peices that so they can pull the dirty one out to wash it and put a fresh one in.
Other options are:
textured tile
non-adhesive shelf liner
newspaper
paper towels
I just set Swordtail's timer for his bath and paused it so I could actually fill his soaking bowl up and he crawled over my phone and canceled the timer
Mirage came out of brumation on April 26. He was doing great. On May 2 he started acting funny. We just redid his tank, and he keeps going into one of his hides. He just lays there. He shows no intrest in food. HELP!