Hi there, I'm new here. I have a 90 gal. fresh water tank. I've had it up and running, successfully, for over a year. It consists of mostly cichlids and a couple catfish and a cool looking eel-like fish. I just some dead fujiian live rock for free. I was wondering if I need to do anything special to put it in my tank, without killing my lil guys? I have them soaking in water right now. The lady I got them from used them in her salt water tank. Thanks for any tips!!