i bought the Remora for my last 45g tank. When i upgraded to the 75g...i really didn't feel like buying another 200-300 dollar skimmer. The Remora is rated at 75g and i realize it may be a little underpowered for my setup, but i'm not finacially able to purchase another bigger skimmer at this point so the Remora will have to do. From my experience though, the Remora does a heck of a job. I have to empty it regularly and it accumulates a significant amout of hard waste. I've yet to have an ammonia problem and i feel like it's working right now. When my bioload increases as i add more fish, i'll have to watch the ammonia levels more carefully to make sure it's keeping up.