As well I doubt it was the Herbtana, yes your skimmer overflows with it, hence the back of it saying to turn off your skimmer, my best bet is you didn't do that and you had skimmate in your cup... it overflowed back into the tank, thus stressing everything in the tank, as mentioned do a good size water change to try and get everything settled again....
Ive used this product for a long time and have never had a single problem with it, I recommend it to alot of people and never had they had ill effects....
Good luck from here on!
Steve
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