Going rock shopping... What's good to buy for caverns?

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Fishman88888

Aquarium Advice Regular
Joined
Sep 2, 2013
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I don't want to affect my water chemistry by choosing the wrong rocks. I've found a guy with an amazing rock collection he's trying to sell....can get a wicked deal ...so any help and advice is much appreciated.

How many rocks can be added at a time?

What types of rock are safe ?

Is there any I should avoid ?
 
If you are able to look for certain types of rock I would highly recommend either lace rock or texas holey rock. Those are a couple great choices for cave making rocks.
 
Sprinkle vinegar on the rock before you put it in your tank. If it fizzes it has calcites in it which can really mess with the chemistry of your water.
 
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