Ask a Question forum: Watering plants with old fishtank water

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Name: Kevin Langley
London UK
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AmberLeaf
Mar 13, 2017 8:18 AM CST
Hi,

I always like to re-use stuff and I was just wondering if its a good idea to use old fishtank water to water plants?

My 500 gallon fishtank is due for a water change soon and rather than pouring the water away I could perhaps use it for my plants?
Name: Heath
sevierville TN (Zone 7a)
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plantcollector
Mar 13, 2017 8:35 AM CST
Is it a saltwater tank
Name: Porkpal
Richmond, TX
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porkpal
Mar 13, 2017 9:00 AM CST
I use water change water from my fresh water tanks for my plants; it also adds nutrients.
Porkpal
Name: Elaine
Sarasota, Fl
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dyzzypyxxy
Mar 13, 2017 9:00 AM CST
Heath is right, Kevin, if it is salt water you can't use it on plants. But if it is a fresh water tank the plants will absolutely love it. Go for it! The more fish waste you can stir up into it, the better, too.

We have a lady on our Orchids forum who grows the most fabulous orchids, many of them watered with her fish tank water.
Elaine

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Name: Anne
Summerville, SC (Zone 8a)
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Xeramtheum
Mar 13, 2017 9:00 AM CST
If it's not salt like Heath asked, fish water is great for watering- plants love all that nitrogen ... it will kind of stink though.
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Name: Kevin Langley
London UK
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AmberLeaf
Mar 17, 2017 2:21 AM CST
Its a fresh water tank. Excellent Smiling I had a feeling that it be good for the plants.
Name: Heath
sevierville TN (Zone 7a)
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plantcollector
Mar 17, 2017 5:02 AM CST
That's a big tank what kind of fish do you have?
Name: Rj
Just S of the twin cities of M (Zone 4b)
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crawgarden
Mar 17, 2017 6:24 AM CST
Do you use any salt in your tank as a tonic?
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Name: Sally
central Maryland
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sallyg
Mar 17, 2017 2:26 PM CST
I loved using fresh water fish tank dregs on plants. I use the gravel vacuum thingie and got a lot of fish waste/algae sucked up into it.
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Name: Jai or Jack
WV (Zone 6b)
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Jai_Ganesha
Mar 17, 2017 10:41 PM CST
Here's my tank:

The thread "Aquatic plants (pics)" in All Things Gardening forum

I use the water to feed my plants every weekend when I do water changes. :)
Keep going!
Name: Karen
NM (Zone 7b)
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plantmanager
Mar 17, 2017 10:52 PM CST
If it's a freshwater tank, go for it! The plants love it and will thank you. I don't have a tank now, but I still use fish emulsion in my plant water.
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Name: Kevin Langley
London UK
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AmberLeaf
Mar 25, 2017 12:27 PM CST
plantcollector said:That's a big tank what kind of fish do you have?


I have 6 goldfish in there

Name: Kevin Langley
London UK
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AmberLeaf
Mar 25, 2017 12:28 PM CST
crawgarden said:Do you use any salt in your tank as a tonic?


Nah I've never used salt, I use water conditioner when doing water changes but thats pretty much it.

Name: Beth
Greenwood, IN (Zone 6a)
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BPadilla
Mar 25, 2017 9:06 PM CST
I have a 75 gallon tank that not only has live plants but holds 1 algea eater, 2 clown loaches, 1 bala shark, 3 tetra (short fin and long skirt), 3 black mollies, 2 sunburst platys, and 4 neon tetras. I can't wait to use my tank water for my garden.

Now we can use it in the garden. Will the water work for house plants too?
Name: Porkpal
Richmond, TX
Charter ATP Member I was one of the first 300 contributors to the plant database! Keeper of Poultry Farmer Roses Raises cows
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porkpal
Mar 25, 2017 9:22 PM CST
Sure. It should be a safe source of nutrients for house plants too.
Porkpal
Name: Rj
Just S of the twin cities of M (Zone 4b)
Garden Ideas: Level 1 Plant Identifier Million Pollinator Garden Challenge
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crawgarden
Mar 25, 2017 10:58 PM CST
So long as you do not use salt in your tank, I had several freshwater tanks that I always used salt in
Prudence, indeed, will dictate that Governments long established should not be changed for light and transient causes; and accordingly all experience hath shewn, that mankind are more disposed to suffer, while evils are sufferable, than to right themselves by abolishing the forms to which they are accustomed.
Name: Yardenman
Maryland (Zone 7a)
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Yardenman
Mar 25, 2017 11:13 PM CST
I routinely exchange about a gallon of my 30 gallon fresh water tank each week and 20% about once a month. It all goes onto my houseplants. If I have too much, it goes onto the flowerbeds.

Those 1 qt juice bottles "just" push into the open door of the hood. I wish they were 1/4" slimmer! LOL!

I can't think of anything bad that doing that would cause, and a regular dilute fish-fertilized water has to be better than tap water.

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