What type of "carpets" ?
In my experience, mixing species of anemones (( mainly S. Haddonis with M. doreensis/LTAs )) doesn't work out -- with neither anemone settling in. You already have 4 anemones (( 2 species )) in a 55, and should try another one, let alone another species.
What type of angel?
The horseshoe crab (( assuming it lives )) will get bigger then a dinner plate, and should be left in the ocean.
EDIT -- you were posting as I was.
Can you give all of your parameters -- with numbers.
How long do you have the anemones before they die?
All from the same place?
For the time being, I would suggest not buying any more anemones until things are figured out.