About a month ago I started hand misting quite a bit and I think that caused my Leucs to start laying. Every time I finished misting the males started calling like crazy. I have one of those misters that you have to pump up with pressure. There are a lot of tall plants in their tank and I would mist for almost a minute so when I was done there was a lot water dripping down through the "canopy".

One thing I've read quite about Leucs is that they like a lot of leaf litter. Mine like to gather together under a piles Magnolia leaves.

Good luck! It's so cool to have your first batch of Leuc eggs.