I read an article on Aquanerd to today about recycling water from a reef to a FOWLR. I happen to have just that type of set up.
What do you think?
using a very similar method with my 5ft SPS/LPS and 4ft softy/LPS set up at present
As the water in the 5ft set up is maintained at correct parameters, well skimmed and also carbon dosed
the water quality in there is an improvement on the water in the softy set up
thus rather than using new water for both tanks at water change time my routine is
remove 5 gallons from softy tank and discard
remove 6 gallons from SPS set up, discard 3 gallons and add the other 3 to the softy set up
softy set up then gets 2 gallons of new water
SPS set up gets 6 gallons of new water