I just put a DI-7 on my waterbox 220.6 (roughly 210 total gallons). I did have to cut the turnover into my sump down as the DI-7 takes a max of ~1800 GPH. If you wanted to run more though your sump I suppose you could add a second DI-7 which would allow you to run ~3600 gph.
I put mine in last week and have had no issues. I did get the old motor with mine however I emailed coralvue CS and the promptly sent a new motor. I will say it is so nice not having to change the filter socks every2-3 days
hey, that's great and helpful information, thanks!! What would you estimate your turnover to be? I'm just getting everything laid out and collected here. My last tank was only 40 breeder so this is a huge jump for me. Looking to get some decent turnover for a mixed LPS / SPS. I would consider two if needed. I've got a MM 3000 gph overflow spec'd and two return pumps (haven't chosen yet but will size them accordingly).