I am someone who went from 3 korallias, and went to mp40 and its worth every penny. nutrient transport mode does that. I was able to go 2 days without changing socks on the reef, unless I heavily fed that day obviously, and now its daily mandatory. The amount of detritus it pulls off the rocks, the sand, the wherever it finds it at a low setting is remarkable. its on the right side of tank and the overflow is on left top corner and it effectively cleans my aquarium. I was using 2 1050s on a switching wave maker and a hydor 4 original and this thing on low keeps my corals extending more, and rocks clean! I know it cost money, but u cant beat its options out the box and battery backup was MY major selling point, otherwise I would still be ignorant to how awesome these are in my korallia bliss.