I couldn't find a smaller bottle for a 30 gallon tank but honestly it still worked a lot better. (Same product, only stronger). Although I've been following this regimen for my Bihir for a few months, he's definitely a lot happier and freer now, just to be sure. I bought anchor worms from a local pet store and tried to get them from him with a small bottle for a month and the eggs and such were still there. This version of the pond really helped him, I would recommend it to everyone. If I had to make the more powerful 30 gallon version a few more months to ensure these worms are completely gone, those with tanks over 300 gallons may need a second bottle. I have probably 75% left in my current one.
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