Landscaping

[aquamonsta]

i have these rocks in my backyard...and they have been there for a LONG time..(since the previous owners were here) and i was wondering. CAn i used them for my fish tank....can i just boil it and do a vinegar test ...and if everything's fine, can i put them right in? Or is there something else i have to do...or i cant... end of story. Well if anyone has advice Ill be glad to hear it.

 

[smb]

I won't advise either way, but I'll say usually softer rocks can't be used.

Hopefully enough people will add their opinions to give you something to go on when all is said and done.