Ich took over tank, Live Stock didnt survive, how do I kill it and start again?

Well the title sums it up well - Ich took over tank, Live Stock didnt survive, how do I kill it and start again? I have a 135 gallon display tank with live rock and sand. Some snails and crabs have survived so far. Purple tang is hanging on by a thread and I don't see him making it to Friday. I also have 100 gallon pond tank that is about half full with more live rock, a giant skimmer, and a dual reactor for GFO and carbon. GFO and Carbon need changed once I get paid so I can buy more. The water salanity is down to 1.008 as well. This is checking with a refractometer with using RODI to clean the glass before and after use. Also ordering the calibration solution here in a week or 2.


Do I need to dry the rock out? What about the sand? Still trying to figure out how the Ich got in my tank to begin with.

 

Tang toast guys. I've tried everything Craig suggested and even a couple other saltwater guys I know from Facebook. He has holes forming in his dorsal fin and he isnt active anymore ie sits on the sand. I can tell his days are numbered but the little bugger wont come out from behind the rock where I can either give him to someone to try and revive or lay him to rest. I figure he'll be in my power head tomorrow or Thursday.

My pain is to shut the lights down come sunday and just let the water cycle with no food or fish in it until Fall Fest if not longer. Should I leave the heating running?