Is it a FO
. You dont NEED any LR
but really get as much as you want with swimming room for the fish. For the LR
to be used as main filtration, get 1-1.5lbs per gallon. I have 130lbs in a 150, but a 220g skimmer and chaeto in the fuge. Also, if ur not using a rodi
unit, I would strongly suggest one. I was doing pwcs every week and couldnt get my trates below 40 because my tap was so bad. GL!!!!!