First - Humblefish - thanks for taking the time to write all this up! I've, unfortunately, have had to take up on the advice. Little bummed that my first post has to be on this, but had it not been for me being able to Google photos that showed velvet, I wouldn't have found this thread and figured I'd contribute to my WIP in hopes that I can help others too.
So, after a vacation - I came back to the onset of what looked like both ich and brook - 1 hippo blue and 1 yellow tang with ich + 2 clownfishes with brook. I was hoping for success with the least invasive methods of care
LFS suggested trying Ruby Reef's Kick Ich and Rally (as I had two BTAs and some inverts). Things did improve - clownfishes didn't show signs of brook after the first 3 days of Rally - Great! The ich... most fell off the fishes and was almost cleaned up - then about a week in, BAM! - Both tangs were slammed with new spots. Not quite enough to make me think velvet; but definitely enough as ich:
So I was told that the new spots were ich that was already on the body, but just hadn't grown to the size that the eye could see. Once they fall - Kick Ich "should" be able to take care of the free floaters from reinfecting the fish.
Ok... I've come this far - finish the regimen at least, if it gets better, continue with it; worse... need more drastic measures. The whole time - all the fishes were happy, eating, swimming, breathing normally (the BTAs not too happy, but that's for a different thread). Upped the food with some Selcon and garlic.
Day 14 comes around - Blue isn't looking too hot and the yellow made it to the pantry at some point for sugar:
That day - started executing Humble's plan. Did the dip (with exception of PH balancing it) - all took it well for full amount of time; did the Rally (as I already had it); got them into QT:
This was just after the dips - looked EXTREMELY better! Blue looked better too, but was shy for the camera and I don't have good enough lights where QT is for pics. Because of the massive improvement - I wanted them to rest for the day, so I didn't add the copper yet.
The next day - both tangs don't show signs of ich or velvet. But the clownfishes both had the spot on the front white band - and looked to be getting worse. Plus there were new spots on the top:
It was time - So that night I did another FW dip for the clownfishes - they still took it well. Fed all the fishes - all were eating well. 10G QT now HT was up to speed - time to dose. Followed instructions to the letter on Cuperamine. I had a 1mL syringe to use - so that was nice to give accurate dosage. I calculated out the water in the tank and adjusted the dosage that should have gotten me the half "acclimation" dosage... Did not! Went straight to 0.35-0.4mg/L! (About as accurate of a reading I can get with my eyes on that stupid color chart of Sachem's - you would think with such a narrow window of where you should be, that they would make the colors more distinct).
Next morning - ammonia badge showed an "alert" level of ammonia. Did about a 15% WC - re-dosed with a little less so I could get the Cu level down a bit to 0.25-0.3. CRAP! I'm now at 0.4-0.5mg/L. what the heck right? I added more water to dilute (maintained SG) and now back to 0.35-0.4mg/L.
Fishes are still happy and eating. Blue has taken herself to wedge between the heater and glass at night; clownfishes have staked their own PVC rooms now (little bummed considering it was so cute when they would huddle in the front corner next to each other at night, every night, in the DT); and yellow really doesn't seem to care where it hangs.
I'll keep posted with more pics as we progress - I hope that I have success pics in the end and that the pics can at least help somebody else that may one day be in my shoes.