Good luck with everything. Marble hatchets will make good tankmates, but I hope your tank is covered - they are famous 'jumpers'.
BTW - May I suggest you have a read of my illustrated Beginner's Guide to Getting Started with Discus - in the Discus Basics for Beginners section of simplydiscus.com forum - link:
http://forum.simplydiscus.com/showth...ed-with-Discus
It may help you launch your project more successfully.