The dreaded seaclone... You won't really ever be happy with this skimmer. For one your level in your tank will rise and fall due to evaporation and adding topoff water. What this means if you do adjust the skimmer, the next day it will be out of adjustment because the water level in the tank is not the same as the adjustment. There are only a few hang on the back skimmers that work well and seaclone is not one of them. Still with any hob skimmer you have to fight the water level being adjusted. This is true with any hang on the back skimmer unless you have some sort of top off system or use it in a sump where the water level remains constant....