Hi Jimmy.
First, I take no offense or feel criticized for your questions. This type of communication is harder than typical conversations and can lead to misunderstandings. Secondly, I am a rookie, though I've studied everything I can and feel I have been obsessive about my aquarium, I am learning things everyday. I have made many mistakes so far, that's why I say "Two Hard years" for experience.
I will try to qualify my statement. To do that, I went back and read my old threads to help refresh my inadequate memory. Here's what I found. As I mentioned, I used Cupramine at first, but was sold a different test kit. I thought my levels were correct, which they were not. It didn't work and after six weeks I still had Ich. I did not see the Ich until I removed the Cupramine, which IMO suggests I had enough to keep it at bay. So I switched to hypo at 11ppt. I knew the importance of accurate readings since the salinity was so low, so I bought a refractometer. There were several people that said 11 ppt was too low and I should use 13ppt, but there was a gentleman named Lee on this site that advised 11ppt, and I developed a lot of respect for him (he has many years of experience). I also called the Oklahoma Aquarium, which has a published article on how they use hypo to treat Ich. Here is the link to that article:
http://www.advancedaquarist.com/issues/nov2004/short.htm .The Biologist there was very friendly and gave me lots of advice. He convinced me that 11 ppt was good. I was into it for three weeks and all the fish looked good, but on the fourth week it came back with a vengeance. I continued on for 5 more weeks, but the Ich would not stop. I was using my refractometer at least once, if not twice daily to check the salinity. The fact that Ich came back after the first Cupramine treatment was stopped (which was flawed due to an incorrect test kit), and came back after 3 good weeks of hypo forms my basis of thinking that raising salinity and removing all copper so that if Ich was barely present it would have a conducive set up to let it thrive again. This could be over kill, but in the "Quest for an Ich free Tank", this doesn't seem to be unreasonable to me. So the short answer to your question is that I believe I was diligent in my management of treatments.
As to a theory of what went wrong, I have read that there are strains that have adapted to low salinity. If you go to Advanced Aquarist march issue of 2004 and read the article News from the Warfront with Cryptocaryon irritans:
Part Five of Five you will learn a lot about these strains. heres the link:
http://www.advancedaquarist.com/index/ .
So my thought of removing all treatments when finished and watching the fish for two more weeks is my own, and not scientific, and some situations might make this prohibitive. But if I treated a fish for the time it takes, then popped it in the display, only to see Ich come back, it would take more than treating myself with copper to get over it. That's what single malt Scotch's are for.
