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Constantly having your arm in the tank to adjust and move things around is not a good idea. The less you interfere, the better.
 
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Home arrow FAQ arrow Quick Info arrow Pollution Indicators

Pollution Indicators PDF Print

Ascidians can be used as indicators of ocean pollution. Microcosmus sulcata concentrates heavy metals cobalt, zinc, chromium and selenium, and Ciona intestinalis indicators iron build-up. Other species accumulate scandium, antimony and some other harmful pollutants.

 
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