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I know that lot’s of you are still gathering information about JBL Manado. The reports on this substrate are very contradictary, that’s true. From my own experince I can say that JBL Manado will boost GH to levels most shrimp breeders do not want to have. Electric conductivity can also raise in levels up to 1000ms. And you unfourtunately will reach this parameter even when washing and rinsing the gravel. Though I am very convinced by many JBL products, I think this gravel is not really suitable for shrimp. Check out Damien’s report, too.

Here is an overview about soils which are often used in shrimp tanks. Be aware that the pH-adjusting capacity depends on the hardness (KH and GH) of your tap water. The soil will lose effect after some months. Most tanks are cycling between 12 and 24 month with active soil.