How considerate of you! When I first saw the thread title, I thought it would be another question about suitable tankmates.
Axolotls do not see very well, so they may not even notice. If you are concerned, though, you could put plants or other decorations along that side of the axolotl tank as a sort of sight shield. Axolotls need plenty of hiding spaces anyway, and they are quick to go to these when they feel shy or threatened for some chill-out time.
Hope your partner knows that nobody will even notice the Chiclids next to the much more beautiful and interesting axolotls!
-Eva