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Are these sea rocks safe for a freshwater shrimp tank

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Hello i'm currently on vacation at the sea. 

I have 2 tanks currently devoted to snowball shrimp and blue dreams. I would like to start setting up my 100L tank (freshwater) for another kind of shrimps, so i found these pretty cool looking rocks next to the sea water. I know i still have to clean them and test with vinegar (which vinegar? Apple or alcohol?)  but could anyone possibly tell me if any of these are good or not good to use just by looking at them... 











Edited by NoGi
linked images for you

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Difficult to tell just by looking at them. 

Some of them look like limestone which is not good for shrimp tanks.

Test with White vinegar.

If you have a Nitrate test kit, use reagent #1 to test rocks. It's an acid and is strong then vinegar.

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those will level up ur gh and kh so its not recomended

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