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There should never be foam on the surface, with the exception of when salt or certain medications are in use. (e.g., PraziPro can be horrible foam-maker, but a good medication.)It should be understood, however, that the presence of some 'long-lasting bubbles' does not necessarily mean the quality is poor, just that it could be better.... And, some 'long-lasting bubbles' in one pond does not necessarily mean the water quality is worse than another where all the bubbles from aeration burst virtually immediately. Soft water will hold a bubble longer than hard water. Generally, soft water is better for koi than hard water. Like with most things, you have to look at the overall big picture, not just the parts.
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