Review on 5.7lb Black Small Decorative Pebbles - Versatile Gravel River Rock for Succulent Gardens, Home Decor, and Vase Fillers by Jennifer Phillips

These are great value for money and the style is nice and they are definitely easy to clean....but after a few washes they started to ooze some black liquid started to ooze and peel off i thought it was because the tank was a little dirty but then i realized the tank got dirty too quickly and fogged up and yesterday my betta was acting different not normal i was dizzy when i checked again she was dead :( took her from the aquarium and i saw a weird discolored part on it like a pink skin tone (my betta was all blue beautiful blue) then she started bleeding black, something on these pebbles is harmful