Well sounds you're well off, here are the links to were I got the food at the most reasonable prices:

And 50% every three days is perfect, 6 is a great group also.





All the fish in my tank, (Discus, Rainbows, Bolivian Rams) eat all the food readily, my Discus have learnt to eat from my hand when it comes to freeze dried black worms, they along with the rest of the fish go crazy for those. Looking forward to your tank.