Sorry I only had a little time it was not helpful and for that again sorry.
A healthy anemone especially a haddoni will bury and attach within hours of acclimation (the two I have had done this in minutes).
With most anemones (as all literature will say) the real key to survival is getting a healthy one to start with(again a huge problem if they are being shipped to you i.e live aquaria style best to see the nem and observe it in the shop for a few weeks while leaving a deposit on it) with your parameters not being the problem I would say that you have an unhealthy specimin due to poor shipping etc.
What acclimation did you use?
But again the only acclimation I give to all my anemones is allowing the bag temp to equal the tank temp and bung them in as I believe complicated acclimation can be just as stressful as letting the get on with it, especially is you try to ensure optimum water parameters in your display tank.
The only problem I have occurred is that haddonis they sometimes look strange when purging areas of the tentacles seem to scrunch up but only lasts a day at most.
Heres mine Theres a recent thred on it somewhere on this forum under new purple haddoni. I have this one a month and a green for 6 months ina 29 as well.
Hope it pulls through, does it feel sticky to the touch you should hve trouble pulling your fingers off (dont pull hard let the nem let go)
