I read all the reviews that the cap didn't fit, the first time I used it I forgot those reviews... I remembered it fell off the second time and I did Had to clean up a huge mess. I have made. The milky white substance in this bottle does not rinse off easily. However I find it works, you need to add it at night after the lights are off, preferably right before bed. The entire tank becomes temporarily cloudy. 3/5 for the cap and the fact that I really can't say 100% that it actually does anything other than cloud the water. I've been getting Coraline since the launch of this product but at the same time I've been using a very well established living stone so I don't know.
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