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I've run into a problem with QT twice in as many months and I'd like to hear opinions from those who may be more experienced than I am. The first time was with a large isolation system while my display was fallow to eradicate ich. I was able to manage ammonia levels, the fish were eating well and getting fat and treatments went flawlessly until I dosed PraziPro. It was around 48 hours after adding the Prazi Pro and I noticed the water clouded up. I assumed it was a bacterial bloom (I had been using Seachem Stability) but I hooked up my carbon reactor. The next day I couldn't see through the water and I was worried about the fish so I took a net and tried to scoop them out. I was surprised to find that I had lost about 30% of the fish in the system. I decided to cut the QT period short and added the surviving fish to the display. I checked the ammonia and it had risen from 0 to 1ppm overnight and that's what killed the fish. I didn't think much of it and assumed I had overfed and gotten complacent about water changes. Thought I had learned my lesson. Fast forward to yesterday. I had a 55g tank set up that I am using for a more permanent QT system for new arrivals. It has housed a single yellowfin flasher wrasse for the past three weeks. Once again, all was well until I dosed PraziPro. I checked on the system before work and the water had started to cloud up once again, only 48 hours after adding the PraziPro. I was able to remove the wrasse and place it into another tank. Based on these two experiences I can only surmise that the PraziPro is having some sort of effect on the biological filter in my QT systems. Has anyone else noticed this, had a similar experience or know what I could be doing wrong? QT details: Filtration is by way of air-driven sponge filters and HOB power filters. The 55g has some live rock in it which I remove during copper and antibacterial treatments. Temps were steady at 78-79* Feedings are light, two or three times a day. Water changes are 50% weekly using water from my main system. Only additive I've been using is Seachem Stability. Thank you for taking the time to read this.
