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Copper sulfate is not overly safe for fish. Especially if the KH of the water is low (copper is toxic at 10% of the KH value). In other words, fish in soft water are at much greater risk of heavy metal toxicity than those in a hard water environment.
If it's an algae problem, there's a product called Algae Fix that you can buy by the gallon (don't remember the manufacturer).
During summer (when the water temps are high), any algaecide can cause a fatal drop in dissolved oxygen content as the offending algae die. Dissolved oxygen content is inversely related to water temperature (that's why when it's hot, you'll notice fish hanging out near waterfalls or in deeper, cooler water).
The other thing you may try is to include a couple barley bales into the pond. It takes a couple weeks to start working, but really does control the multicellular algaes (string algae, angel hair algae, blanketweed are some of the names).
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Jesse
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