Corys and changing gravel

[sarcare]

How long until returning fish?

so I took the fish out of the twenty gallon to change the gravel, I put them in a ten gallon with the filter and heater. I took most of the water out of the tank to add the gravel, which was flourite and some round brown gravel. I added some water to plant the plants, and though I rinsed the flourite five or six times it is really dusty. How long do I wait until the cloudyness settles before I return the fish? I don't want to hurt them, so I am wondering if it is better to keep the fish in the ten gallon tank and wait for the dust to settle or return the fish and water and wait then?

 

[sarcare]

Ok, I was impatient (I know I know patience is required for this hobby!) and decided to put the fish back in the twenty gallon. Well actually I did a search on here and found that someone had said the cloudyness doesn't bother the fish, so I risked it, and they seem fine. The perams are 0 straight across for nitrates, nitrites, and amonia, but I'll check again tomorrow to make sure it doesn't spike or anything with a minicycle (I think that is what it is called)

I decided to mix the flourite and the black existing eco-somethingorother in most of the tank and leave a four inch square lower area with the original depth undisturbed so the beneficial bacteria would stay. I kept maybe 40% of the original water and replaced the rest, and everything is ok for now.

Thanks for the help!