This thing needed to go back into the DT. I know I may sound like a broken record, as I have said this several times before. There is a time and place for treatment, but we must recognize the risks involved and restrain ourselves from going overboard.
This is a perfect illustration. Your nem definitely needed treatment, and it responded well. However, once it recovered, it needed the pristine conditions necessary for these animals to survive and I believe it has taken a turn for the worse because of the sub-par conditions found in HTs (no personal affront to you intended - I don't care how often you change the water). Don't forget the basic premise here: gigs and mags are incredibly sensitive creatures that require the very best conditions. Therefore, jumping the gun or going overboard with treatment can only do more harm than good.
This is absolutely correct.
I have been nursing my purple gig and at the 8th day of Septra, it looked good so in the morning I stopped dosing. I did a 100% WC, but I made the mistake of not cleaning the tank and by afternoon the gig was deflated and looking like it was about to die any moment.
I spoke to a reefer friend of mine experienced keeping gigs and he told me I had to keep water as crystal clear as possible and do it asap, so as a last resort I pulled out the gig, emptied the HT, and cleaned everything, heather, wavemaker, aquaclear and washed thoroughly the tank with rodi and a bit of white vinegar. Then I filled it up with new water and placed the gig inside. You have no idea how bad it looked, I was convinced it was gone.
The water and tank were crystal clear, I left on actinics at the lowest setting for the night. This morning when I got up and checked the tank I couldn't believe my eyes, the gig went from pancake flat with gaping mouth to fully inflated. I was literally amazed. I'll post images on my thread, so you can see the before and after as it was truly dramatic.
I am convinced that 2 things happend.
1- I overdosed Septra, I think 8 days total and 4 after it was always fully inflated are way too much medication. I should have stopped at 5.
2- I only cleaned the HT with some paper towels when I did WC's.
Despite I was turkey basting and doing multiple WC's per day, I wasn't doing a thorough cleanup. I really begin suspecting that during treatment and expecially after it is critical to keep not just the water as crystal clear as possible, but also the tank, and all the rest of the equipment that is in contact with the polluted water. Now I ordered spare nano koralia's and aquaclears so I can always put in clean ones after each 24 hours.
It is a massive effort to do WC's and keep everything spotless, but I think it's worth it.