It all comes down to poo... (Scrubs)

Recently picked up a couple of Orange banded prawn gobies, also known as Randalls Gobies, from Live Aquaria. They're in QT now and one of them has red poo. Anyone ever seen this before? Any ideas?

The fish seem very healthy otherwise and I can't say that this is neccessarily a sign of bad health but it is a curiosity.
 
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