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Got to get those copper meds going and up to treatment level. Hannah checkers are good. You have to be in the 1.75 ppm to 2.0 ppm range I believe for it to be at a therapeutic level. Someone can correct me if I may be wrong.
You are correct. According to @4FordFamily, "UPDATE: We have discovered at least one strain of velvet that survives 1.75 PPM copper, we recommend increasing to 2.0PPM to eradicate it." He was referring to dosage for Copper Power. Just to be on the safe side, I'd get Copper Power as many of us here trust this copper brand because it doses consistently in strength as per directions on the bottle. Not all copper products seem to do that. I like to ramp up the copper to medicinal levels over a few days. I watch my fish to see how they're handling it and go more quickly or slow down based on their behaviors.
Treat fish in a separate tank. Copper cannot be removed from rock and sand well and it will kill your biological filter and any corals and/or inverts you have in the tank.
I'd also pick up an ammonia badge to monitor ammonia levels during treatment (other types of test kits give false readings due to the copper in the water). Your sick tank will need a heater and HOB filter. Do not add absorbing materials in the HOB filter chambers, just floss to catch fish wastes. You could add some Marine Pure blocks, especially if you have them in the MD already as they will help jump start the cycle. You could pick up some instant cycle in a bottle to help start a cycle as well, which will help reduce the number of water changes needed during treatment.
Of course, you'll need to monitor ammonia, copper, and PH levels closely everyday. Don't add sand or other decorations to the tank. They can absorb copper and can release it later at lethal levels if the PH suddenly drops. Just add some PVC pipe pieces for the fish to find shelter in when needed.
Finally, you'll want a reliable copper test kit to monitor levels of copper in the tank. They must remain constant throughout the whole 30 day treatment. If they drop below 1.76, you'll need to start the clock over. I like the Hanna high range copper checker. API test kits are not very accurate, IMO, because the color range on the test kit is difficult to gauge. An air stone helps as well during treatment to keep the water well oxygenated.
I know the above must sound overwhelming if you've never done a copper treatment before, but it is doable. We're here to help if you have any questions! Good luck. I think the hardest part is catching all the fish! When I had to do this for the fish in my 180 gal tank, I gave up and just took out all the rock so I could catch them more easily.
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