based on the fact that humans consume loads of it, and I believe it is made
of food grade stuff, I think it would be okay to add it..try a drop -- a
small drop per gallon or two....I think it would be exactly like any DOC.

maybe you can call the food coloring company and ask...

I can see no harm in this besides maybe to those who view this tank





"Charles Gillen" wrote in message
...
I guess this is a very bad idea, but I thought I might as well ask here.
I
have NOT done it, and probably never will. Anybody ever try to tint the
water blue-green a bit?

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Charles Gillen -- Reston, Virginia, USA