Boil it first, then freeze it, then boil it again. You can test it in vinegar afterwards if you want. If there is any fizzing/bubbling, it's not safe for your fish. If it passes the vinegar test, soak them for a couple days in conditioned tap water and then add them to your aquarium.
yes you can
to circulate water in fresh water tank to expansion talk.
A tank is just a box made out of glass. You could put either salt water or fresh water into this box with the appropriate filter media. No, fresh water fish cannot survive in salt water, but it doesn't matter what kind of tank (box) they are put in. note: most fresh water fish like a little bit of salt in their water. It improves their gill function and gives them needed electrolytes. However, this is only a small amount (1 tablespoon per 5 us gallons), so don't overdo it.
the glass tank explodes!xd
Robert Frost
Yes
i dont really know sorry
It will swell and burst
they will die
it would shrink
yes and when it breaks your water heater will leak when the steel tank rust.
A water pump is needed to pump in fresh water.
Start with an almost full and fresh water tank. Turn the water heater off and let the water cool. Dilute 1/4 cup of household bleach for each 15 gallons of tank capacity in to a gallon of water. Add the chlorine or water solution to the water tank. (Do not pour straight bleach into the RV fresh water tank. ) Let the chlorinated water run through them for 1 or 2 minutes one faucet at a time. You should be able to smell the chlorine. Make sure you are using the water pump and not an external water supply. Top off the RV fresh water tank and let stand for at least three hours over night is better. Drain the system completely by flushing the faucets for several minutes each. Open the fresh water tank drain valve to speed up emptying the tank. Open the hot water tank drain plug and drain until it is empty. Close all valves and faucets and drain plugs. Fill water tank with fresh water. Flush each faucet for several minutes each repeating until the tank is again empty. (Make sure you are using the water pump and not an external water supply.) Fill the tank again. The water should now be safe to drink but if the chlorine odor is too strong you can repeat the fresh water flush. Your RV fresh water system should now be safe to use.