after my trouble in determining whether red shale was aquarium safe, i now have another problem with the piece of red slate i just bought.
it has some little gray specks on both surfaces. is it safe to use in my aquarium?
ps it looks very similar to the red shale which the-wolf said could not be used.
it has some little gray specks on both surfaces. is it safe to use in my aquarium?
ps it looks very similar to the red shale which the-wolf said could not be used.