Pico tanks

I just got done setting uptown new 75 FOWLER and my 21 reef is filling up quick so I thinking of a new tank already. I'm really interested in pico reef and I'm up for the challenge, but having just set up a 75 gallon tank I am a little short on money wanting the whole setup under 200 dollars not counting rocks sand and fish im interested in the cad light 4 gallon and ecopico the highest light coral would probably be a piece of birdsnest the rest being softies I am completely open to any other tanks you know of but I also saw a nano box aio tank was wondering how much $$ that was and how good it is