On Sun, 29 Feb 2004 14:31:08 -0400, "Kelly"
wrote:

mine scratch a lot as well, did you put any salt in the tank? check for
raised scales, or white spots, it may be a parasite, but I find if I do a
water change and forget to put in salt, they scratch a lot more.

I agree. If I change the water and take too long to add my baking soda
and epsom salts, they'll scratch for a few hours.

Also, mine sometimes "scratch" in the sand when doing their breeding
rituals (I watched my male and female red zebras do that this
morning).