I have had saltwater tanks for 2 years!! I also have a 55g freshwater tank and I will tell you from experience that the freshwater is sooooo much easier and cheaper to take care of!!! I am putting in way too many hours on the saltwater tanks! I have 2 125g SW tanks - one reef/sump/refugium with 150lbs. of live rock & one all fish tank with around 75lbs. of LR. & 1.5" sand beds - I want to convert this tank to freshwater!! Is there a way to do this and keep the sand & Live Rock??? Can you use Tonga or Figi LR in a freshwater tank?? Any ideas or thoughts would be greatly appreciated! I may also get rid of the reef and make a freshwater tank - I haven't decided yet!! Thanks!