[Woodstock]

With that red base, it looks like a Heteractis magnifica, Ritteri

OR

a Macrodactyla doreensis, Long-tentacled anemone


http://fins.actwin.com/articles/choosinganemone.php

Macrodactyla doreensis, Long-tentacled anemone These anemones have very long (up to 5-6 in.), smooth, thick tentacles sometimes with longitudinal stripes extending into the oral disk. The tentacles originate from a round flat oral disk, distinguishing it from the condylactis anemone. The foot of the base is almost always bright red or orange.
Good Points- They are hardy if kept under Metal Halide lights. Under lower light levels they seem to slowly waste away. They come in a variety of patterns and colors including purple. Accepted by Clarki clowns, tomato-type clowns and pink skunk clowns. Bad Points- They must have bright lighting. They normally live with their base buried deep in the sand and sometimes have a difficult time finding an attachment spot in a reef-type tank.

Heteractis magnifica, Ritteri, African, yellow-tipped anemone This anemone is usually rather large. Their tentacles are long with very blunt tips that are lighter in color than the shafts. The base may be red or purple but brown is more common.
Good Points- They are relatively common in the market. They are accepted by almost every variety of clownfish.
Bad Points- They tend to move to the highest point in the tank, often up the sides of the glass very near the water return pipe. In nature they tend to be found at the highest parts of the reef exposed to strong light and currents. In the aquarium they will need very strong lighting (metal halide) and very strong alternating (wave) currents to do well. They also have a reputation for being able to catch and eat medium sized non-clownfish.

Feeding your anemone

Feeding can range from 3 times a week to once every 2 weeks. Some aquarists have had success not directly feeding their anemones at all, although I suspect their anemones are capturing food that is meant for the fish. Food usually consists of a piece of raw shrimp about the size of the anemone's mouth. Lance fish, silversides, clams, scallops and other frozen marine organisms can also be used, but I find them more messy. A large bag of peeled and deveined shrimp can be obtained from one of the local discount supermarkets and may last many, many months and has the added advantage of being fit for human consumption.

Liquid foods and Target foods may actually be harmful to your anemones directly (several aquarists stated that their anemones started to die as soon as they began to use liquid target foods) and indirectly though degradation of your water quality. The jury is still out on vitamins. I could not find any common thread in my data that would point towards them being helpful or harmful. My suggestion would be to use them sparingly, or not at all.