So I see a ton of information here talking about tank transfers and long arguments on whether to rinse sand or not... I don't care about sand. In 23 years of keeping reefs, I have found no true benefit to sand other than keeping creatures that need sand obviously. Sand gets dirty and nasty, and whether people want to admit it or not, it is typically the eyesore in some rather beautiful reefs. Any way, I will get off my soap box. I will be transferring a 40 breeder system into a 65 gallon system. I was thinking of just moving all the water from one system to the next, using all the existing rock, topping off the additional 25 gallons with fresh saltwater and then over the next couple months adding one small piece of dry rock to the aquascape at a time until I get the rock quantity up to the optimal amount for a larger tank. I dont see how that would be much different than a large water change. I have a mixed reef, softies, LPS, and SPS. With a light bioload as far as fish are concerned. Am I over simplifying this? Please poke holes in my theory. Remember, bare bottom to bare bottom, no sand in the equation what so ever.