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hooha · 07-02-2008, 12:22 AM

those are nice rocks, lots of 'character'. I can't identify the type of rocks, but if you want to see if they will affect the GH of your tank you can get a strong acid and see if it 'sizzles' when you pour it on the rock. People use muriatic acid from pool supply stores, but I've find the easiest way to obtain a strong acid is to get 'pH Down' from your LFS - it is basically sulfuric acid and works for this purpose.

07-02-2008, 12:22 AM	#2 (permalink)
hooha Moderator Join Date: Apr 2005 Location: Pittsburgh area Posts: 2,088 iTrader Ratings: 59 iTrader Positive Rating: 100% Plant Points: 71592	Re: Rock ID please those are nice rocks, lots of 'character'. I can't identify the type of rocks, but if you want to see if they will affect the GH of your tank you can get a strong acid and see if it 'sizzles' when you pour it on the rock. People use muriatic acid from pool supply stores, but I've find the easiest way to obtain a strong acid is to get 'pH Down' from your LFS - it is basically sulfuric acid and works for this purpose.