Hi Shadowfax, is your red whiptail what is also known as the red lizard whiptail,or L010a? Just wondering what subsrate you have them on? Ive got a few of them and they love a sandy bottom, they find it easy to dig through it with their whiskers when feeding.
If they are the same fish that we have , the recommended temp for breeding is 82.F, which is quite warm and also a good temp for getting rid of whitespot. Apparently catfish are more sensitive to treatments, but i have dosed my tank with white whiespot cure to help the guppies with them, as i spoted it early on. Had no problems and the whitespot went. Depending on what other fish you have in their tank they can definitely handle increased temp. You could possibly try Melafix rather than whiespot cure if you are concerned with that.
Good luck helping he/her heal,they are beautiful active fish