and this is the description:
NATURAL CARRIBEAN REEF PIECES. These are NATURALLY SUN CURED CORAL REEF, (dead coral ), sAFE FOR all tanks and aquariums.These are ALL NATURALLY FORMED pieces of CORAL REEF, NO brokes, or ruff edges. CORAL helps eliminate CHRONIC PH PROBLEMS, and will help purify the water Bacteria. Its a NATURAL carbonate Buffer.
i hope i didn't get hosed on this




but on a side note, i lost a stripped something and a red zebra
this never dawned on me, but they got sucked into my back filter. i bought my setup used, and it didn't have that little extension tube. i asked the guy i bought it from, and he said that the fish will learn not to get too close to it. in the 2 years that i've had that tank, never got one sucked up and i had convicts galore. those suckers kept breeding like crazy. anyway, i had a plastic end cap cover filter thinga ma jig that i just put on there. so now if they get too close, worse that will happen is they will get stuck to it. (i hope)