Further to David's warning about the molasses, the mixture's toxicity to the fish and other aquatic life in the pond will vary greatly depending on whether you use orange oil in the mix. Orange oil--or, for practical purposes, d-limonene--apparently is considered to be toxic to fish and at least some other aquatic life at fairly low concentrations. The reported LC50 concentration of ~ 33 mg/l for fish implies pretty high sensitivity. (It's not clear from the reported ecotoxicity data whether or to what extent that level takes into account the usually-added emulsifier(s).) How much orange oil/d-limonene you can use safely will depend mostly on how much enters the pond in relation to the pond's volume. Also, the published 28-day biodegradation period may not apply for the aquatic environment. If you use it around the pond, be careful.
_________________ In theory, theory and practice are the same; in practice, they aren't -- lament of the synthetic lifestyle.
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