Food coloring??

[Mount_Prion]

It turns your poop blue if you eat it.

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And that, ladies n' gents, is profundity.

 

[wallin115]

Food coloring is water soluble, so all you'll end up with is colored water. Besides, the chemical composition of food coloring is mostly derived from coal tar and many color pigments have been connected to asthma, allergies, skin rashes, carcinogens, anxiety, depression, itching, migraines, weakness, and ADHD in people (to name a few), so I don't imagine that they will do your fish much good - in fact just the opposite.

Agree, doesnt food coloring contribute to deterioration of the atmosphere as well? I recall hearing that somewhere. If you want to boost your fishes color the best bet is high quality diet, big tank, low levels of stress and appropriate tank mates. Cheers!