> I guess my question is, should I keep the sugar syrup warm or keep it
> cool to prevent the mold..

I don't know of any harm that can be proven to come from that mold, 
which is common in sugar feeding, but of course it is unsightly and 
undesirable.  Sorbates will help prevent it, but we just live with it, 
and try to use thick syrup most of the time.

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