Tetracycline color

I recently had a problem in my ten gallon divided betta tank, where one
betta, a relative youngster, started laying on his side on the bottom
of the tank, appearing very lethargic, sometimes barely breathing and
other times visibly gasping. The other two bettas in the tank seemed
fine, and there was no external sign of disease that I could recognize.

Not knowing what to do, and feeling compelled to do something,
anything, I added Tetracycline (from Aquatronics) to the tank,
following the dosage instructions on the package - one capsule every
other day for five days (I also did a 25% water change prior to each
dosage).

I'm happy to report that the betta is looking much better, swimming
around and acting normally. But the water color is red. Kool-Aid red.
Is this normal? I know that with water changes and charcoal in the
filter it will go away, but I didn't expect this color.


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