I stripped one of my two holding female Placidochromis electric blues.  But I only found one 1 baby Syno. multipunctatus in her brood.  Maybe I will get luckier with the other female when I strip her next week.  I did get a bunch of baby electra.  I split them up into two groups.  About a dozen in one tank and the rest in the breeder with the baby catfish for it to chew on.
 
Andy

Your further then I was ever able to get with the multis.  The first time I tried to work with them I had 6 wild caught males-no girls!  I added 3 girls to the group later on but still had no luck.  I now have a wild group of 11 fish...haven't sexed this set out yet and 5 tank raised adults that look to be 3 female sand 2 males.  Now to pick out a cichlid to keep with them...

I have heard that peacockse good with breeding multi's, the only drawback is that the peacocks get smart enough to catch on after about 3 or 4 spawns and act accordingly, lithobates on the other hand are supposed to be really stupid with whats going on and will continue to spawn allowing the multi's to intercept the spawn

Was reading that A. Burtoni were good to use also, so I gave Dragonkeeper a group I had to use and they just spawned for him the other day and got 12 Burtoni eggs and 27 Multi eggs so the Burtoni seem like they are pretty good to use also

Mine are still pretty small.  Only about 3" long.  I am sure that when they are older they produce more eggs.

I DON'T THINK SIZE MATTERS, IN ORDER FOR THE SYNO-MULTIS TO SPAWN THEY HAVE TO BE AT LEAST 2 YEARS OLD.