I have been having problems as well. On three separate occasions over the past 2 months in 3 different q tanks I have had velvet survive and kill fish in copper. All three occasions were fish being treated in copper power. First time was a total q tank wipe from velvet with levels between 2.25 and 2.5. From initial symptoms to death of all fish was over the course of a week. Velvet was observed on the fish throughout the treatment.
Second failure was a powder blue tang and tomini tang treated at 2.5 according to the checker. No initial symptoms but over the course of 2 weeks symptoms developed first on the pbt which developed spots and started swimming into the current. The tomini tang started the same symptoms after the death of the pbt and died a week later.
Final failure was in yet a separate q tank with a blue spot angel. No initial symptoms but spots started to develope after 2 weeks in copper levels at 2.85. In addition to the checker this bare tank was dosed carefully and should be close to this measurement based on dosing. The fish is currently in a formalin bath and will be transferred to a tank being treated with chloroquine phosphate after the bath.
Meanwhile another group of fish was received 2 weeks ago showing signs of velvet. This group of fish was from a tank breakdown and he had been losing fish consistently over the past month so they appear to have had some resistance. Upon arrival all fish were showing spotting on the fins and avoiding light. These fish were given a formalin bath and than transferred to a tank with cp. They are currently free of spots back to swimming normally and eating well.
So either I am dealing with a copper resistant form of velvet or my checker as well as dosing measurements are off or something is wrong with my copper power that prevents it from working but still allows it to be measured. Final possibility is I am dealing with some other disease that very strongly resembles velvet.
Second failure was a powder blue tang and tomini tang treated at 2.5 according to the checker. No initial symptoms but over the course of 2 weeks symptoms developed first on the pbt which developed spots and started swimming into the current. The tomini tang started the same symptoms after the death of the pbt and died a week later.
Final failure was in yet a separate q tank with a blue spot angel. No initial symptoms but spots started to develope after 2 weeks in copper levels at 2.85. In addition to the checker this bare tank was dosed carefully and should be close to this measurement based on dosing. The fish is currently in a formalin bath and will be transferred to a tank being treated with chloroquine phosphate after the bath.
Meanwhile another group of fish was received 2 weeks ago showing signs of velvet. This group of fish was from a tank breakdown and he had been losing fish consistently over the past month so they appear to have had some resistance. Upon arrival all fish were showing spotting on the fins and avoiding light. These fish were given a formalin bath and than transferred to a tank with cp. They are currently free of spots back to swimming normally and eating well.
So either I am dealing with a copper resistant form of velvet or my checker as well as dosing measurements are off or something is wrong with my copper power that prevents it from working but still allows it to be measured. Final possibility is I am dealing with some other disease that very strongly resembles velvet.