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12,332 Posts
Thought I'd pass it on.
https://www.golias.net/akvaristika/experiments-substrates-analysis.php
Note to @Quagulator and his old question in the 90 Gallon Custom thread..
https://www.golias.net/akvaristika/experiments-substrates-analysis.php
Note to @Quagulator and his old question in the 90 Gallon Custom thread..