That pic had a bit of a greenish tinge to it. Does it look greenish in real life or was that just the picture? You may have had some algae in there too. Buy some iodine too. A few drops will kill anything in your water. Some coolant additives have this in them already but it's cheaper and usually better to go the antifreeze/iodine route. Zerex and Redline have a tendency to foam up for some reason.
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