mitchellmoto
Member
I believe it is $0.25 per gallon. Well after you put sand and your rock in your tank will be less than 55gal. I personally keep two 50gal containers full. One is my RO/DI and one is premade salt water. You are certainly going to need extra RO for topping off your tank. You will need to top your tanks off daily to keep your salinity stable and compensate for the evaporated water. So you will want a tleast an extra 5-10 gallons laying around for this purpose.