I've heard of people rinsing their mysis shrimp, pe mysis, etc with RO/DI water and thought that was extreme. I am now an extremist lol, I put a cube in a cup last week and let it melt in the tank water I collected like I always do, then as I swirled the cup around I noticed how cloudy the water was so I let the shrimp settle and poured out the cloudiness. Added some more tank water rinsed off the shrimp again and emptied that out. I will never put all that cloudy mess in the tank anymore.