Hi guys,

I bought 5kg of these rocks from polyart clementi at $4/kg and I need help to identify these rocks.



I'm curious to know how much these rocks will affect my tank's parameters.

I have read about the vinegar test but I only have Chinese black vinegar at home . Which I used and see no fizzing.

Not sure if this will help but here is a close up picture of one of the rocks.



Any help would be appreciated!