| http://www.w3.org/ns/prov#value | - well check for hard metals in the tank.. they are sensitive to it.mmaybe do a water change add carbon if possible I can try to get a test kit, but I highly doubt there are any metals in the tank, nothing has changed since I set it up except for that filter being added, and the tank has nothing but cleaned playsand, rocks, pvc tubing, a fake plastic plant, and the crayfish, as well as a plastic box
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