Well adult leleupi are well known for killing small shellys like multies (short term I would expect no major problems but it is a ticking time bomb I think).
so yet another reason to say... Yep very happy to keep em for you but they need a tank that you give me. :wink:
Bargains are only bargains if they are the fish you select for your tank.
Far better to go a group of say J.ornatus than N.leleupi if looking for a communitty type tank and add nothing and remove the mulies if looking for a Tropheus breeding tank.
All the best James