Ironic
When I first started keeping fish in the late 1950s, one way to treat ick, was to throw a few "real" copper pennies in the tank, and it worked, until they stopped adding real copper to pennies..
Here in Panama, I will often collect a fish, that has an ick cyst or 2 , and the water in certain slow flowing areas will have temps in the mid to upper 80sF.
So it may matter the origin of certain ick infections on how they are treated. A michigan strain might easily be thwarted with a high temp, whereas a Panamanian strain might laugh raised temps off.
There are also strains from the African rift lakes, immune to a normal osmotic treatment, so if a wild caught rift lake African may require a higher dose of salinity or even a med like Malachite.
OMG I learned that penny thing from my aunt who kept tanks! One of my first tanks and I got too excited buying fish from different stores (guppies, mollies, platies and snails) and ended up with salted fish, lol...
So I had lotsa pennies and dumped a couple hundred in the tank. All pennies before 1982 are copper, the rest are zinc plated with a thin layer of copper. Left them in for about a month...looked real funky (tacky, heh) but did the trick! I had so many pennies in there even the newer ones helped. Fish were fine afterwards. It was hard keeping the bottom clean though. When I took them out, YUCK.


