A well made modern glass aquarium can be left empty for many years provided it is cleaned before being put away safely for storage.
First, leave the bag with the fish in it floating at the top of the tank. Leave it there for thirty minutes for the goldfish to get used to the water temperature, then you can put it in the tank.
Tank water will slowly warm to ambient temperature. It will not get any hotter.
depends how long it takes if short leave them in a bowl with warm water longer i suggest the sink or if big enough leave it out
how long does it take for hot water after lighting water tank its gas?
adjust the heater on your tank, it will take a while to change the water temp, so as long as it is gradual, it wont hurt em
6 hours
An empty Tank.
At least 1 week, test your water before you add any fish, you may need to leave it for longer to allow the ammonia level to come down. I had to leave mine almost 3 weeks.
NEVER leave water in a RV for more than 30 days. If you do fill the tank add a 1/2 cup of bleach to the tank let it rest for about 1hour and flush tank 2 times .Never leave water in tank in winter time or you will be replaceing it in spring.oh if its a 50 to 100 g.tank use 1 cup blech.
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If your fish don't eat it in a matter of 1 hour remove it from the tank.
The hot water tank might be undersized for your usage.