I am moving my Crayfish from a 10 gallon to a 20 long - I decided to switch from Gravel to sand in this tank. I rinsed the sand until I thought it was clear - but after adding to the tank and pouring in the water, it's still very cloudy (milky like). How long till this settles and is it ok to run the filter? I don't want to lose my BB in it. Finally - I'm holding the crayfish in a 5 gallon bucket temporarily with an airstone, how long can he stay in there?