12 Volt - in your opinion is the Discus "payoff" worth the work??
depends. what many discus keepers do to avoding doing the w/c's on massive tanks is to start the small discus in a smaller tank and grow them up to sub-adult size before moving them into the main big display tank.
many go barebottom as mentioned - much easier to keep good water quality that can stunt juv. discus.