Wasnt trying to start a bash our LFS for diseased merchandise thread, so sorry if it went in that direction.
Ich isnt really the problem, it exists and its common. So is the fact that we have an immense number of members who can treat it successfully with little to no issues.
Whether its qt with meds or hypo or constantly feeding metro everyone has a way they have overcome it, I just havent found mine yet. The mistakes I made early on have caused the ich to be a constant issue, the mistakes I made during qt allowed it into my dt. The mistakes I made when treating the fish whether it was my botched hypo that turned into hypoammonia, my stint using metro that just prolonged the amount of time I let the fish stay in my dt, or this last screw up which i still cant figure out.
The point of the thread was looking for advice on how I screwed up this last time, which thank you guys I did get some good input and possible ideas of how I have killed my fish this time.
The last fish that died for what seemed like no reason may be a non ich related death. After looking at considering everyones input I looked at every step I had for my hospital tank. So possibilities including but not limited to the following.
F buying heaters from petsmart the store brand they sell after tearing down the tank I found the entire glass of the heater to be about half full with water, maybe I chose to electrocute my fish this time.
Cupramine has an interaction warning with some declorinators, although it was filled with water from my main display the tank previously held one of my ornery cichlids which had most of its water come from tap and was treated. Its initial set up it was filled with tap and then dechlor, so possible residue.
Just temp fluctuations, that heater has shown not to be great quality and in a ten gallon tank it will lose heat or heat up very quickly.
Bottom line is there are so many damn variances, I just didnt have it nailed down. Ill be attempting to pull the last two fish from my dt this weekend. A chromis and a damsel. Both these guys are hardy as hell and have lasted through 3 ich outbreaks and countless moves in and out of qt without ever getting a spot. The tank there going in will be a 20l with different heater/filtration and another sump sponge. Will see if i can balance this little tank out and time it with my dt running fallow to try for new fish in the future. My reef will just remain a reef till then with no fishies.
If ya have any input on setting up the new qt/fo observation tank or whatever it will be called

please let me know.
Its a 20l with a 30g aqualclear filter, a sponge/powerhead and ordering a jebo heater for it tonight. Standard lights no substrate just some pvc for them to make homes. Will be filled with fresh salt rodi water and ran for about a week before attempting to start the cycle. Was going to use dt water, but since it has ich at the moment not sure if thats a good idea.
Once again toss me any input on setting it up. Ive read every link ever tossed to me, but I miss things.
And please dont turn to a bash fest on the LFS, some suck some dont. All of em got the pain in the *** job of dealing with fragile living things and for the most part do a decent job. There are so many other things we can pick on em for the ich is just a scapegoating them for what we already know is a pain in the *** issue to deal with.