Unusual problems are described in designing and installing a cathodic protection system for two steel tanks at the Miami Seaquarium. Problems involved working under water because tanks could not be drained and damage to anodes and their leads by large fish and sea turtles. Vertically hung anodes were not suited because they would interfere with performances of the porpoises. Descriptions of anodes, conduits and volume of impressed current are given. 5.2.1

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