I've done several SW to FW conversions (and vise/versa). Like FishGeek stated. Just clean the tank like you would any used item. Super easy, no need to use the sump/bioballs etc, if you didn't want to. I use bioballs, sponges etc when I want nitrates to build up a bit to supply FW planted tanks to feed the plants.
Clean/rinse .. is all there is too it.
__________________ Used to breed Angelfish, Bettas, Apple Snails, now culture corals and FW plants & enjoy the tanks below... 90g S.A. Cichlid Tankbuster types, 46g planted bowfront w/tropicals, 30g long planted w/tropical mix, 28g Bowfront SW Reef w/corals, 12g Nanocube FW Planted w/German Blue Rams, 10g Nano SW Reef w/corals, 5g Planted FW w/diamond tetras & misc shrimps   |