<span style="color: black"><span style="font-family: Verdana">One thought, I started out with Instant Ocean (regular) and went to Reef Crystals. I did not realize until later that it was suggested to do a gradual change. I did not suffer, but thought I would pass it on.</span></span>
<span style="color: black"><span style="font-family: Verdana">One other thing, not sure if it is the Reef Crystals or all salt - but I used to mix it and pour it in right away. I had 2 fish with pop-eye (?), apparently due to a piece of salt getting in their eye. Now I mix and let that sit for about 24 hours to really dissolve and then pour in.</span></span>
<span style="color: black"><span style="font-family: Verdana">One other thing, not sure if it is the Reef Crystals or all salt - but I used to mix it and pour it in right away. I had 2 fish with pop-eye (?), apparently due to a piece of salt getting in their eye. Now I mix and let that sit for about 24 hours to really dissolve and then pour in.</span></span>