[MiniMango101]

I have had some shells/rocks for about a year... they just sit around and do nothing at all. I was wondering if they would be safe to put into my aquarium and if so, what could I do to make 100% sure that they are safe- I love my betta to death!
Thanks~

 

[Bikeridinguckgirl14]

Make sure the shells are thick (not fragile) and that if you run pantyhose over them the pantyhose don't rip. Do pantyhose test on rocks as well. Then remove any rocks that look like they have copper/iron in them. Then put the rocks in a bowl of water. Any rocks that secrete baby air bubbles are too porous, take them out. Finally wash the remaining rocks and shells In super hot water then you can add them

 

[MiniMango101]

How do I tell if my rock has any copper or iron in it? It's just a dull black rock by the looks of it.

 

[Bikeridinguckgirl14]

Iron rocks have rusty colored spots and copper ones have green spots

 

[MiniMango101]

Oh, ok! Thank you for helping Midnight be her best

 

[mart]

Avoid these rocks:
Limestone: Unless you are wanting to raise the GH of your water
Sandstone: can contain possible metals
Quartz : some can contain metal. If they don't then it's ok to use