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Are sea rocks safe for a freshwater 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... 

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  • 2 weeks later...
  • 2 weeks later...

If they test okay with white vinegar they may be okay. I have done the same thing but I boil them first for several minutes. 

The shale type will break apart over time and your pH could run HIGH. I did not do a vinegar test I just boiled them suckers good. Bit my pH is almost 8 :) 

My RCS are all doing okay and they make babies ?

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