Rach -
I suggest that you don't feed your anemone anything larger than the size of a pencil eraser.
Certain anemones do not have to be fed all that often. A carpet may need more feedings but BTA's LTA's, Haitians, sebae's really don't need meat as often as everyone thinks. I have gone as long as 2 months without feeding my BTA's.
Remember that they are photosynthetic animals and as such lighting is a most important factor, extra feedings is not a long term substitute but can help some, especially with poor lighiting. Yes they do like to be fed on occation, they will puff up and look great, but don't over do it. Twice a week is plenty. They will only take what they need and would reject to much food IMO.
Lighting must be PC, VHO, MH or MH combination. Normal output lighting will not do at all.
Adult brine shrimp is not very nutritious.
Silversides, mysis shrimp, krill, squid, formula 1, frozen plankton are all good. You should rinse frozen foods and a vitamin suppliment can be used like Selcon, Zoe or Zoecon.
Microvert and liquid plankton are not enough IMO.
Post a pic of yours if you can, I'd love to see it.
Good luck
Thomas