At wits end: First PDF leucs tank false bottom and substrate questions!

[Mariah Ingram]

First post here and lots of questions so bear with me.
Here are a couple quick facts. I have a 18x18x24 Exo Terra, I would like to have three D. leucs, I still feel lost in the dark after a good week and a half of doing research, lol.
After some consideration of what I thought would work, and budget. I came to my choice of doing a really simple false bottom. Hydroballs>mesh/substrate separator>Eco earth>sphagnum moss> and leaf litter (ordering soon). I also have a little area in the corner with largish rocks where the water likes to bead and trickle down to the false bottom for easy access (also have tubing at the back that runs under the bottom so I can siphon out any excess that’s too much for my rock access). I will also have a share of live plants which I’m still doing copious amounts of research on as I want them to be perfect for my future leucs. My questions are these.
1. Have I been correct in my false bottom? I’ve read so many variations at this point I’m losing my mind :P. I want to make sure my little babies will be happy with what I’ve arranged.
2. This is enough room for 3 leucs correct?
3. Plant suggestions?
4. What kind of top/lighting will I need poorly lacking in knowledge there.

here are some small poorly taken photos of my attempts so far.
Any and all answers, advice and words of “CALM DOWN YOU’RE FINE” are mighty appreciated.