So I just had a frustrating experience while utilizing this method and could use a little advice. Now I do not believe the problem I had was the fault of the method but rather is something I did. I have used this method a few times before with success and I actually think think this is a nearly complete yet simple to follow method so hopefully a little advice from the experts can help figure out where I went wrong.
I ordered 3 fish recently. A juvenile flasher wrasse, juvenile halichoeres wrasse and a goby. They all arrived alive and seemed to be doing alright. I had the salinity in the first tank at about 1.017 and Cp level was 1.15. Both tanks are 10 gallon with HOB filter, powerhead, heater, airstone, ammonia badge and acrylic covers with pieces of PVC inside. I had left them up and running from my last successful QT so I expected them to already be cycled. They both have a bit of algae on the glass and pvc, but that's about it.
Since the salinity was nearly identical to the water in the bags I simply floated the bags for 20 min then opened them and placed the new fish in the tank. I was raising the Cp levels by .25 a day to get it to 2.0 and it settled just above that. All 3 appeared to be doing fine for a couple days, would go after the medicated food when I put it in. After a couple days I found the flasher wrasse dead when I checked on the tank in the morning. I figured this may have been a case of the general trouble I have quarantining flasher wrasses. I have always had difficulty with them.
About 4 days later the other wrasse died. I noticed its behavior had changed to be more timid than when it first arrived, but wasn't sure if the lights coming on was startling it when I came into the room.
The goby made it through the full 14 days in the first tank and I transferred him the the second tank which had a matched salinity. The next day I started the GC treatment. After 48 hours I actually noticed the ammonia badge in this tank move up to alert, so to mitigate that I changed a gallon of water to mitigate that with the intention of changing more water the next day. Unfortunately the goby died this morning though.
So what should I have possibly done different? It's very frustrating and disheartening to lose an entire order. I could certainly use a little guidance to give me a bit more confidence going forward. I truly believe in quarantining fish and particularly this method, however, quarantine has been a somewhat frustrating process for me over the years at the same time.
One thing I plan on doing immediately are 100% water changes on both of my QT tanks. Beyond that I'm not entirely sure how to proceed.