If you get that 40 make sure you eventually move the discus to that tank. They will outgrown that 29 quickly. a guy I work with got an almost full grown discus after much deliberation to put in his 30 gallon tank. He said after acclimating it for hours, he put it in the tank and it turned almost balck and hid in the corner because it felt so stressed and cramped. He returned to the fish store that same day because he was so nervouse about stressing it to death
