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The longer the better. If you used live sand and live rock in the setup it helps cycle the tank faster and better. There are also live bacteria products one can purchase and pour into the tank to speed things along. The first fish I always recommend are damsels since they are readily available, pretty, and inexpensive. I would wait a week, add the damsels, then wait another week, get your water tested at either your local petstore or if you have a testing kit yourself then if all checks out and the damsels are doing ok start looking for your first permanent fish occupient. most petstores will take back the healthy damsels, and some will give you a little store credit for them.

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15y ago
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15y ago

Depending on the species of fish and the aquarium set up. A fairly safe time would be to leave the fish overnight to settle in and feed it/them in the morning. Again depending on species it may be advisable to remove uneaten food after half an hour or so.

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14y ago

Well, Whenever I get a new fish-tank I have always whipped it out with a wet cloth. After that you can start adding water. You can either put water in buckets/jugs (I use about 5-6 soda bottles for a 10 gallon tank) and let it sit for 24 hours before putting your fish in the tank. Or if you have a bigger tank you can use a garden hose and put water in your tank. Its all up to you. Also, if you have goldfish and are putting them in a tank you don't have to wait 24 hours before putting them in. But those are the only fish that you don't have to let the water sit before putting it in your tank.

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13y ago

Before you buy a fish you need to cycle the tank, meaning you need to put the water in, turn on a filter that is big enough for your tank, and adding water-safe (a dechlorinator) to the tank and letting it run for 24 hours.

Then after you've cycled the tank you can put the fish (in their bags from the store) in the tank and let them float for 30 minutes so that they can adjust to the temperature of the water.

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11y ago

From what i know as long as there is no alge in your water you can leave the light on in the day and like my tank put a night light on at night and turn it off when you go to bed the fish do like some dark :)

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15y ago

after you establish the right water temperature

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13y ago

24hrs or your fish will die or put age resting and then you could put them in after a hour

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15y ago

A couple weeks, with a source of ammonia. You may want to read an article about cycling your fish tank.

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12y ago

about 10 minutes and if not kill your fish?

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Q: How long do you have to leave fish tank on?
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