Finaly I found forum were I can find some opinions on Tunze equipment. Acctualy I have alredy use, for two weeks a Tunze 3130/2 skimer, in my tank 120x65x40, and have only 3 fish , also 85lb Live Rock. Device skim to litle foam or maybe I 'm not enough experienced, maybe this is normal. I wonder is my choice good about this skimer