Ok, so I'm thinking of starting a planted discus tank... I've been into FW fish for 6 year now, with my biggest current tanks being the 180gal and 125gal. I'm really into the "monster fish". So, I'm not in any need of help in terms of water quality, filtration, stocking, etc. etc., but need some "matters of preference" advice.

Should I start off in a 75-gal tank, or dive straight into the 125? The 75 would be easier to manage in terms of water changes, plant upkeep, costs, etc., but the 125 would definitely look nicer.

Should I go for an all-blue strain or discus, or add some other colors in there as well? I really like the blues, but I also like the oranges. Should I stay simple and stick to one color, or have a colorful variety? Or maybe majority blue with several oranges to stick out from the crowd?