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Are these sea rocks safe for a freshwater shrimp tank


ImBoB

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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... 

IMG_4061.JPG.70bbd3fd97314ae32be7ce3ae03

IMG_4062.JPG.9f7002eb74a8348fe790cb26586

IMG_4063.JPG.8dec5c6856b17c5fc8aaef02b3a

IMG_4065.JPG.c5b10cd22d3f734927902b90a58

IMG_4066.JPG.707550f00a680db42428367bd49

IMG_4067.JPG.70ccfb51e9f437804c5f74acc01

IMG_4068.JPG.55e7346a4edc7838a9667c11af7

IMG_4069.JPG.c00769515f386afe00b48b35f9d

IMG_4070.JPG.649c6a9df8aaa625574926e1448

IMG_4071.JPG.454dfb403d4518c769b0cc3ad60

Edited by NoGi
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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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