Breeding (from what I've seen) can be induced by temp swings. Give them a few days in the mid 70's then kick it up to low 80's. Have a larger group helps as well.
And then the seasonal breeding is always usual, as with any exotic.
The Gel diet is AWESOME. I love the stuff. I feed to to almost anything. I used it for all my reef fish, most of my freshwater fish, some of the inverts have eaten it as well. I had an arapaima I aquired from the Ft Worth (TX) zoo that would eat it. I've used it with all my freshwater river turtles as well as my sea turtles.....well, you get the idea. It's got a great nutritional value and being that it comes in a powder, you can add any thing you want to it (fruits, veggies, meds...)
Matt