Sorry for the thread revival.
I have been keeping Multis for about a year now in a 5gal tank. I stated with 6 young adults. They do take a long time to settle in to their environment. It took mine about a month before they stopped hiding every time I approached the tank. A few glowlight tetra helped them get more confident though, but it was only a help. they still needed time to settle in.
I had my first brood of fry about 4 months after setting the tank up. You can try to encourage spawning by using slightly colder water at water changes to simulate a rainfall. Unfortunately, before the fry got much of their colour (at about 6 weeks old I guess), my filter packed in whilst I was away from the tank for a couple of days, and all the fry died, along with 3 adults. The dad of the first batch of fry died a month later. It almost seemed like he died of a broken heart as he lost his appetite, and didn't really do anything except hide in or next to the java fern on a bit of bog wood for the last few weeks of his life.
I was then left with just 2 adults, who subsequently spawned and are rearing the brood of 15-20 at the moment. Most of the juvis are 15ish mm long, and are currently doing very well. Its amazing how much sand they can move about in a short period of time
I have promised some to a mate, but if you still need some I might be able to sort something out for you, depending on how many my mate wants. I want to be left with 4-6 juvis also. I work in the west end if that's any good to you.
You shouldn't keep any cories in there, at least small ones. I tried, and as soon as they had fry or eggs in a shell they went totally territorial and killed them. If you want to find tank mates I would recommend anything quick that's mid/top water, and nothing too small. For instance, young neons would be in danger, but older ones would be fine.
Also, If anyone else on here keeps multis and is agreeable, I would be interested in swapping some young ones to diversify the gene pool a bit.
I don't have any current pictures of my set up, but would be happy to take some if anyone is interested.