There are common names used by me, Ryouh stone . I'm from romania, try to get along! Waiting to hear from you, if you can help. Are close.
Hey clau74, sorry meant no offense....have been able to understand what you saying so far. Ryouh stone is a fairly common rock used for aquascaping and its from Japan (to the best of my knowledge)
Not entirely sure what you mean by the last couple sentences but if you have any questions feel free to post.....and thank you for your fish stocking suggestions so far! Have a good one