Have just been reading up on anemones at WetWebMedia....
http://www.wetwebmedia.com/anempt2.htm
Quote:
The removal of regurgitated food in mucus balls and bands through netting and siphoning must be a regular maintenance feature. Digestible foods are converted almost entirely into ammonia...to be removed by system filtration. Some filter-feeding anemones produce mucus nets, pass them up and over, trapping particles and ingest the whole mass. Mucus strands from locomotion and filter-feeding do not appear to be toxic.
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Seems like anemone waste removal is a recommended practice. Who wudda thunk it?