You'll definitely need to monitor your water chemistry... every day. Especially with the larger setup.
With more grow beds, you'll need to manage much larger quantities of ammonia and nitrite and with larger fish, you need lots more food and a very good filter system. Water chemistry can get out of wack pretty quick so a test kit is a must have.
Also for the big system, you'll need lots of water flow in and out of the fish tank. I would recommend the bilge pump at Harbor Frieght.
This pump is awesome for the price. I bought 2 to have one as a spare.
http://www.harborfreight.com/16-horsepo ... 68422.html
Here's a pic of the IBC fish tank I set up. This one is holding about 250 gallons since I needed to chop off the top.
[attachment=0:wbidus2g]2.2.12 Fish Tank.JPG[/attachment:wbidus2g]