Thank-you
@HotRocks and everyone else who had a hand in doing the research and testing to figure out this Hanna Copper checker works.
I watched the thread and saw what happened and bought the Hanna Copper check a few months ago, knowing I would need it.
I have a couple Potters Wrasses in quarantine right now and started copper power 4 days ago.
I planned on ramping the copper level up over 6-7 days ( usually 4) because I've had trouble getting potters through a full quarantine period before.
I did not test the copper level for the first 3 days because I used such small amounts.
First thing this morning, I used my API test kit and got the usual uncertainty that I always had using this kit. I figured the copper level was, maybe 1 ppm, or maybe somewhere between 1 pmm and 2pmm. Not really sure.
So then I opened up the Hanna box and gave it a go this morning and while I was a little unsure and had to re-read the directions 4-5 times as well as I was doing it.
When it was done I knew exactly what the copper level was.
There is no doubt.
Makes me wonder how many fish I killed with overdoses using the color tests, and how did I ever end up getting ick free fish.
Now if I could only figure a easy way to get all the powder out of the packet and into the vial. lol