Don't worry, that's a mythWas told bowls could damage the eyes of the fish.
Thank all of you for your imput. I do not have the bowl on the microwave but was wondering if it would be ok or not. I actually have him on my kitchen counter (away from the stove of course) but i cant seem to keep the water at a good temp. I was thinking it was because its on an outside tile wall near a window. I dont know where else to keep him (out of reach of my 4 year old) which could be harmful to him (if you get what im saying