Update
I've decided I'm going to put rainbow fish in the 6 foot I'm not to confident with putting discus in it atm. So im buying a 70 gallion and I'm going put the discus in that with a few pots corys and tetras. Then after a year or 2 I'll change from gravel to sand In the big tank and move most of the fish from the 6 foot to the 70 gallion and move the discus to the 6 foot.