Mar 29, 2014 #1 pollex.jaypee Aquarium Advice Activist Joined Mar 2, 2014 Messages 185 Location Camarines Sur, Bicol, Philippines What type of rocks are these? Are they aquarium safe? Got it from hardware sand. Thank you. Attachments IMG_7073.jpg 133.8 KB · Views: 59
Mar 29, 2014 #2 OP OP pollex.jaypee Aquarium Advice Activist Joined Mar 2, 2014 Messages 185 Location Camarines Sur, Bicol, Philippines Just tried the vinegar test, no fizzles. But still worried.