I just bought a used 12g nano cube at a garage sale. i set i up and filled it with water and its been running for two days now. the tank has this horrible smeel now of chlorine (bleach) . my living smells like a pool. the water smells. i added prime but still smells. i dont know why they would have put bleach but now im paranoid that they did for whatever reason. is there anyway to test if theres bleach or something? would the prime nutralize any chlorine traces to a non toxic levels? what do i do to clean the tank of whaterver chemicals might have been used?