Red slate rocks?

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TiffanyT

Aquarium Advice Apprentice
Joined
Feb 2, 2014
Messages
12
Location
Alberta
Hi, I bought these new rocks at Big Al's in the aquarium rocks section, I've rinsed, scrubbed and soaked them and I did the vinegar test (no fizzing) but when I put them in my tank air comes out of them and it leaves a slight film on top of the water. Any idea if these are safe?
 
How long did you soak them? If it still leaches out stuff air is fine but if it did create the film on top of water I would take it out soak for longer. Did you rinse off the rock really good after testing with vinegar?
 
I soaked them for a couple hours. I'm boiling them now to see if that helps.
 
I would advise not to boil rocks because I have heard if it has air pockets and it is heated to a very high temperature it could explode but that is a very rare thing. I think I also heard that it could activate chemicals in the rock but that could be wrong.
 
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