Here's the deal, the more DOC
's get removed the less nitrates get produced, hence, the less water changes you need. Saltwater is pensive. At my lfs
I can get a 200 gallon salt mix for 50 bucks, that is .25 a gallon, and the RO
water equals out to around 1 cent a gallon on average. So for arguments sake lets say .26 a gal
. If you have a good skimmer, you can usually do monthly 20% WC
in a FO
tank. at 55 gal
this is a 10 gal WC
. This adds to 2.60 a WC
. Not that bad for a monthly keepup.
Now consider that without a Skimmer your likely to need weekly WC
's to keep up, and possibly more than the 10 gal
depending on your load. So 2.6 X 4 = 10.4 a month. At this rate you basically save a minimum of 7.80 a month. For a goof AquaC Remora at what, 100 bucks, it takes only one year for it to pay for itself monetarily, not considering labor, and that it could add up even faster.
So no, you don't need a skimmer, there's your answer