normally trace amount of chemicals left over in rads can cause this to happen. Just flush you system out and we normally recommend a biocide Such as ours or PT nuke.
We have a new biocide coming out soon which we have tested expensively with all our dyes that combats the issue with many biocides out there at the moment.
All so under testing if in the UK we have found that some deionized water you can buy is just as bad as tap water. If you what to test this you self just get a PPM meter and check the water you self. You can all so nip out to you local Aquarium dealer and pick up test strips for penny's that will show what the PPM value and PH vale of your liquid is.
Our red dye is fine between the values of PH 5.5 to 9.
If you would like us to test a sample of you liquid to see if we can see any problems just give me a shout over PM and i will look into the liquid for you free of charge. You will have to pay P&P to us though and we would need at least 50mls of the liquid.
Edited by Mayhem - 12/1/11 at 7:59am