Ok a little update here. I got the crystals in and mixed up my solution of 4oz(1/4lb.) in a gallon of water and let it set over night to dissolve. The next day i did a 50%WC on my feeder tank and then tested the water for chlorine about 5minutes after the tanks was full and before the filters were turned on. And I found zero chlorine in the water

. I then tesed for ammonia just to see about the chloramine bond and i also found nothing. Or atleast it was such a small amount that our aquarium test kits could not show it. After a few days with no fish loss or signs of problems in the feeder tank i then went ahead with my WC schedule and changed the breeding tanks and the Htat (payara) tank and have had no ill effect what so ever. I would recommend this stuff to anyone that wants to save some money. The price is under 16bucks shipped and it treats 60,000 gallons if you mix it in a solution. ---------------------------------------------------------------------------------------------------------------------------------------------let me know if you decide to give it a try and what you think. There is also a good read on wikipedia.com about this
sodium thiosulphate that may interest you.