In article ,
Amber wrote:

Hello,

I want to add some attractive rocks and slate that I have found in my
garden and collected whilst on holiday to my tropical tank, however I'm
wary of introducing nasty's.

What is the correct procedure please?

You want to make sure there's no metal. Avoid green rocks
and ones that have shiney flecks. Test it for being
too soft by putting vinegar on it. If it fizzes you can't
use it.

Otherwise just clean it and you're good to go.

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