hello, I'm concerned about my sump. I have a 65 gallon tank preparing to buy a bimac octopus and my wet dry filter that is rated for 65 gallons, I was wondering if I have to buy a sump 3x the size of the tank like they recommend or if I can just keep the wet dry I have and just buy a protein skimmer rated up 220 gallons. I'm 17 and tight on money, so it would be helpful to know the right way to go. Thanks.