[pogodzib]

For cleaning purposes, I like the 30" DT height much better than the 36" height. I always have a tough time reaching everything near the bottom of the tank in my 220.

In the sump, I would get rid of the drip plate and media. Debris can get trapped in those areas and cause nitrate issues. Instead, I would recommend having a refugium area. I have my sump set up with a refugium area on one end of the sump, my skimmer on the other end, and the return pump in the middle section of the sump.

For your overflow standpipe, most 6' long tanks have 2 drain lines so you can push more water through the system and don't need to worry as much about the single drain line getting plugged. I like the look and space used by coast-to-coast overflows and recommend that you check it out. If I did a custom tank, I'd use them instead of standard overflows. Everyone that I know that use them, love them and say that they wouldn't go back to standard overflows.

I'd keep the carbon as it is never harmful to a tank. It helps keep contaminants and the yellowing of water out of your tank.