Tropical Fish Keeping - Aquarium fish care and resources

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meatball 01-31-2009 10:29 PM

A Quick Question

I'm new to the hobby, and I am a little confused on exactly when I should add dechlorinator to the water in my tank. Is it best to put it in the tank before you put water in, put it into the water before you put it in the tank, or put it in the tank after you put the water in?

Sorry for wasting your time with a question whose answer is probably really obvious.



Twistersmom 01-31-2009 10:48 PM

Hi meatball!
What size tank do you have?
If there are no fish in the tank, it does not matter how you do it.
On my smaller tanks, during water changes, I pretreat the water in a 5gal bucket before adding it to the tank.
On my larger tanks, I add the dechorinator into tank then top it off straight from the tap with my python gravel cleaner.

meatball 01-31-2009 11:06 PM

My tank's 20g, and I do have fish in the tank - 7 Gold Pristella Tetras. They're great, and I'm thinking about adding some invertebrates soon. It's all VERY exciting.

Anyway, is turning your gravel cleaner around a good way to top off a tank? I've been using an old, but clean, milk bottle.

syrinx 01-31-2009 11:31 PM

Whatever is easiest for you is fine for topping off the tank. Same for adding the dechlorinator. Use the recommended amount for the water you are adding.

meatball 02-01-2009 10:26 AM

Ok - one thing I'm worried about, though, is stressing my tetras out by suddenly adding the cold water to the tank. Is there anything I can do about that?

Freddiesbuns 02-01-2009 11:05 AM

You can use hot tap water to adjust the temperature BEFORE adding it to the tank. I use a floating thermometer to make sure the water is at the same temp.

meatball 02-01-2009 11:14 AM

Nice, that will make things a lot easier. Have you had any problems with sediment buildup in your heater changing the water at all? I was wondering if that would make a difference at all.

willow 02-02-2009 04:27 PM

personally i would use boiled water rather than water from the hot tap.
i don't always do this,and my neons have been fine.
fill the bucket with the new water from the cold tap,add the boiled water and stir it around,
then test with a thermometer,add the dechlorinater then you can add it back into your tank,and you
won't have to worry about cold water.
a cooled temperature can induce spawining in corydora catfish :)

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