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There is also a difference between "poisoning" the tank, and an ammonia spike from a dead animal. The former can be things such as cow fish, sea apples etc. that literally have poison in their bodies that is then released when the organs that hold the poison degrade and release. The later is caused from the breakdown of a large amount of organic material decaying in the tank. When anemones die it is the latter to be worried about.
Now, you need to figure out why they died. What kind of anemone was it? What are your tank parameters? (with numbers) size of tank, lights (number, color of bulbs, specs), flow, tank inhabitants, anything else you can tell us. There is a reason why they died, and before you put another one in the tank you should figure it out so it doesn't happen again.
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