Adding River Rocks to an Established Aquarium

#1
While shopping yesterday I purchased some river rocks. The packaging stated they were for aquarium, fountain, crafts, or candle accents. The labels stated one is tiger’s eye river rock and the other assorted river stones and river pebbles. Are they safe to add to my aquarium? If so, what prep should I do before adding them? I know to rinse them of dust and such but are other steps needed? I love the look of these but do not want to cause any harm to my tank.
 

Newman

Elite Fish
Sep 22, 2009
4,668
0
0
Northern NJ
#6
put few drops of vinegar on each rock and see if a reaction takes place. if it fizzes that means the rock is not inert and will raise your pH. you cannot use it then...