Safe Rocks

  1. G

    GrumpyOldMan Valued Member Member

    I am looking to add some type of big rock to my 75 gallon aquarium purely for decoration. I have done a lot of research and have found that there are many different opinions as to what is safe and what is not. My PH already tests quite high with the API kit. 7.6 - 7.9. The tank is moderately planted and has two pieces of Mopani wood with java moss and a several anubias tied to one. I have one area however that IMO would make the tank complete should there be a rock in that area.

    So what is safe and will not leech chemicals or raise the PH still higher?

    I have heard about the vinegar test but have also heard that it is not totally reliable.
  2. Coradee

    Coradee Moderator Moderator Member

    Steer clear of rocks with veins in them as some can affect fish & kill inverts if they contain copper & other heavy metals, limestone & sandstone should be avoided too as they can alter the ph.
    You can test rocks using vinegar although it's not 100% accurate, if they fizz then they're not safe to use
    Most rocks collected from streams should be ok unless they're near high industrial areas, clean & sterilise well before use with boiling water & give them a good scrub.
  3. OP

    GrumpyOldMan Valued Member Member

    What about Lava Rock? My LFS has some nice pieces and says they are freshwater safe.