So I recently had a massive outbreak of GHA and I couldn't come up with any reasons as to why after testing for the basics. I went down to my ATO and tested the TDS and it read 40! I quickly put my RODI on, made a gallon fresh and saw 10 on my meter. Questions ... #1 any reason why there is such a difference in fresh to stored water ? #2 ( I think I know the answer) would a high TDS lead to GHA? I have all new membranes and filters on order, plan to empty and scrub my storage container, scrub my rock as best I can and treat with Fluconazole. Any feedback will be greatly appreciated.