Jeez I figure there would be more opinions by now
Tired of typing the same thing over and over. Pumps 8-10 X turnover--300X10 is 3,000 GPH. Overflow/drains need to be able to drain that much water. Jaws777 just posted that PVC drain rate graphic today in another thread. If you want the tank to be quiet, do a Herbie style drain with a gate valve.
Get a box/aquarium/sump/bucket/rubbermaid that is 20% of the size of the tank or bigger. Put bio media in laundry bags. Rig up some filter socks for mechanical filtration. Don't need any baffles in a freshwater tank.
Call thefilterguys.biz and tell them you want a chloramine filter setup. They'll tell you the part number for the system you need. Buy that, change the filter cartridges every 4 months, and you don't have to do water changes anymore.
So just gravel vac turds off the bottom and clean the filter socks every few weeks. Feed the fish every day or so. Email Jeff Rapps for fish -- or cichlidsoftheamericas.com. Watch em fight. After a year or two, they'll be big and colorful.
Maybe stock Nitrofurazone and Kanamycin, PraziPro, and some epsom salt for meds.