OK, here's what a little research turned up. The Euroreef CS6-1 is rated for up to a 100 gal
tank. Cheapest price I found for it was $338.00. The CS6-2+ is rated for up to a 125 gal
tank and sells for $418.00. The Aqua C EV 180 is rated for up to a 270 gal
tank and can be had with a Mag 7 for $356.00. The Aqua C EV 240 is rated for up to a 360 gal
tank and sells for $449.00 with a Mag 12 pump. These are the ratings supplied by the manufacturer. IMO
, most manufacturers are a bit liberal with their ratings. I have never used the Euroreef or the EV series so I can't recommend either above the other. I have used the Aqua C Remora though so I know the air injection principle works well. My opinion is that you'd be just fine with either brand as long as you get one large enough to handle your tank.