I don't know as if it is the sand itself that is floating around in the water. I don't know if some of this silica powder is still floating around and that's what is clouding it up. I'll do another water change today, and probably put some of the water from the 125 where my fish is and put that in the 55 where he is going that way he has a lot of the same water properties again so there's not so much change/shock.