I have never used it but have known people that have and say it works great (Bio-Spira) Have you tried a site on the internet? I am not saying to do anything illegal, but just a suggestion to find it. I like to use fosterandsmiths.com personally. There is also a site called aquatic supply where you may be able to find it.
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When you feel like this...  , just watch your fish, & have a tasty beverage (of your choice, I like Kool-Aid)!
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