I used 250 mg tab in 10 gallons. I agree with the water being a HUGE factor, in the beginning. They can look fine for a week or month in your tank, you may not realize or know it, but the tank MAY NOT BE A SUITABLE TANK FOR ANEMONE SUCCESS, or may need a small adjustment. If it too new, or out of balance, DT may have too much or too little x,y,or z.... IME, carpets can take a month to a year to fully acclimate, not all the same. I used a HOB skilter (just a HOB with a surface skimmer) to surface skim the surface protein in TT with an air stone in the back of the skilter. I kept a filter sponge in the dark part of my sump that fits my HOB to collect the floaties the anemone releases, and only rinse it in DT water every water change. I changed 100% every evening before lights out, and add meds at lights out. In the beginning, 2 changes a day MAY be needed. THEN, I make my water for the next day. This step I believe is critical. Water must be consistent - aerated and aged 24 hours. You want the water used to be 24-48 hours old, so all the chemical reactions that happen in the new water are the same value, not given more or less time to complete their reactions, or start new reactions. This is the easiest way to be sure of consistency. Pull off a storage tank may be fine for some, and not others. Light and flow are critical too. Too much light is worse than not enough, IN THE BEGINNING, but weeks later comes a time when it MUST get ramped up, slowly ramping to insane intensity. Higher flow in the beginning is better, they are bags of water that may need help flushing. I would ramp up the light hourly on day one until I found the point of collapse, then back down a bit. When they collapse in treatment I would make a change to encourage inflation. 100% inflation 100% of time is goal, when they deflate I don't stand by and wait, change flow, light, or water. Each situation is different.
I believe there are some that could recover with the water exchanges only, no meds. Looks to me like everyone puts their hope in meds only, and not a strict flushing / treatment process / visual indications. Stability and consistency in the process is key. I have only tried a couple haddoni, for me haddoni do not respond near as well as gigs. But for me, if I was to purchase more gigs, I would proactively treat every gig I got, I've lost too many adding one that wasn't treated. Whatever is going on, it can spread.
Chris Davis, I'm sad to see you lost your blue carpet. Just my opinion, and I could be wrong, but my best guess as to what happened to yours is too much light combined with a water chemistry it didn't acclimate well to. I know some do have success with haddoni and Cipro, but I never had good results. For your blue carpet to look so good on day one and go downhill how it did leads me to believe it was originally healthy and degraded from water quality, combined with too much light (light shock) right away. I would have tried a flush. No disrespect, everyone's water gets off a little bit from time to time. I know, everything in your tank is doing well, but it may not have agreed with a carpet, they seem to like aged (almost dirty) systems the best, with algae. Anemone may need the very food people try to strip out of the water to avoid algae growth, who knows. SOME SPS systems may be a bit too clean, some may be fine for a carpet. When my sps die, my carpets do amazingly well, flip side when my carpets do poor my sps seem to grow best. I don't get it. If I was in your shoes, that was a perfect candidate to go through a placebo treatment, meaning go through the 100% water change schedule with no meds. Just what I would have tried seeing the progression you posted. Some anemone come in you just can't save no matter how hard you try, but gosh that guy sure looked good in the beginning. Sorry you lost that guy. Better luck next time, that's the fun of the hobby. Enjoy it! Try again!