Stripped 2 from a yellow lab, and another 5 or 6 from two separate strips of Deep H20 Haps. The yellow labs had several additional spawns after and no Multis. The Haps simply never bred again. I believe the pressure in the tank and disturbance from the Multis was enough to shut the Haps down.
As for feeding.. pretty much anything they can get their mouth on. I use a different product than everyone else it seems, from Aqua-Pharm but they will accept and eat whatever you give them. Never been a big NLS fan. I know, I know.. shoot me.. LOL
I usually mix a couple multi fry in every fry tank I have and they do fine. I have only lost one Multi in 2 years and it was an adult. Still not sure what happened.. but they can get a little aggressive with each other at times..
-Marc