It,s expensive but at the end it is not because it is concentrated and you only use a drop or 2 depending on your aquarium size. I have my bottle of amino acid for more than a year now, so it's not that expensive considering this.
I use Zeovit amino acid and Zeovit coral vitalizer. 2 bottles of liquid that you use by the drop and last for a very long time.
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More fish die from human stupidity than any other disease...
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