I have and established 10 gal tank. I have 2 male fancy tails, 4 cory cats, 1 bushy nose place, and 1 otto cat in this tank. I bought a new 20 gal tank. I put sand in it and it is crazy cloudy. The sand was the type that came treated so I could move the fish over more quickly, but the water is not clearing and it has been about 5 hours. Here is the problem. in my 10 gal tank 1 of the fancy tails has come down with ich. I noticed it this morning. I put off medicating hoping I could move the other fish into the new tank before medicating, and leaving the sick guy in isolation. After waiting all day I finally had to medicate as my sick guy is struggling to swim. Is it safer to leave the other fish in the medicated tank, or should I move them to the new tank even though it is super cloudy?