O.h for sure...NOT! I have a 29gal going for some time now but its going through cycling.
I'm still battling Velvet which has been an ongoing almost three month now. I was trying many things just to avoid use of copper but tried everything and now copper is the only thing I got left.
I can control the Velvet by transfering the fish every three days to new clean tubs, yup every 3 days (I'm sOoOOo tired) and FW dips but can't rid the Velvet only control it. I have tried & treated with, "Rally, "Acriflavin", "Hypo-transfer", "formalin"and now "Marex-Chloroquine Phosphate (Product from the states)" with little success.
Since I have scaleless fish (puffer & cowfish) I was warned to say away from the product "Paraguard", So looks like copper which is my fear (overdosing) is the only option I have left or watch my favorite fishy friends die.
So looking for what people have used for copper here (CopperSafe or Cupramine) and the problems you came across. I know no one likes to talk about fish they lost due to overdose but sometimes it helps others to watch out for the those things.