I've heard that it is safe to use tea from tea bags to darken water as a replacement for black water extract or tannin. Is this true? If its true how much(# of tea bags) would it take for a 60 gal. tank.
I really havent heard of such with P's (and wont attempt to try), but hear of it on different community fishes. Most tea bags are made out of different and natural herbs which can mess with your water. Try using black extract from a LFS. They're cheap, simple and safer than adding something in the tank you have doubts about.
Yeah, I'd urge you not to use tea bags in your tank, ever! It's not natural, and can be very harmful to your fish.
If you want a tea color for your tank water, use peat or black water extract as filter media, but only for a short period at a time!!!
Two things to to keep in mind: those two filter media mentioned will have a profound effect on your water perimeters (for example: pH will drop, and there are more effects), so keep a close eye on them and test regularly. Also, if you are using active carbon in your filter, remove it, since it will undo the effects of peat or black water extract, and in particular the water coloration...