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Mar 13, 2017 8:18 AM CST
Thread OP
Name: Kevin Langley
London UK (Zone 6b)
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?
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Mar 13, 2017 8:35 AM CST
Name: Heath
sevierville TN (Zone 7a)
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Is it a saltwater tank
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Mar 13, 2017 9:00 AM CST
Name: Porkpal
Richmond, TX (Zone 9a)
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I use water change water from my fresh water tanks for my plants; it also adds nutrients.
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Mar 13, 2017 9:00 AM CST
Name: Elaine
Sarasota, Fl
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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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Mar 13, 2017 9:00 AM CST
Name: Anne
Summerville, SC (Zone 8a)
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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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Mar 17, 2017 2:21 AM CST
Thread OP
Name: Kevin Langley
London UK (Zone 6b)
Its a fresh water tank. Excellent Smiling I had a feeling that it be good for the plants.
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Mar 17, 2017 5:02 AM CST
Name: Heath
sevierville TN (Zone 7a)
Beekeeper Bee Lover Composter Frugal Gardener Houseplants Region: Tennessee
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That's a big tank what kind of fish do you have?
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Mar 17, 2017 6:24 AM CST
Name: Rj
Just S of the twin cities of M (Zone 4b)
Forum moderator Million Pollinator Garden Challenge Plant Identifier Garden Ideas: Level 1
Do you use any salt in your tank as a tonic?
As Yogi Berra said, “It's tough to make predictions, especially about the future.”
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Mar 17, 2017 2:26 PM CST
Name: Sally
central Maryland (Zone 7b)
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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.
Plant it and they will come.
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Mar 17, 2017 10:41 PM CST
Name: Jai or Jack
WV (Zone 6b)
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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. Smiling
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Mar 17, 2017 10:52 PM CST
Name: Karen
New Mexico (Zone 8a)
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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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Mar 25, 2017 12:27 PM CST
Thread OP
Name: Kevin Langley
London UK (Zone 6b)
plantcollector said:That's a big tank what kind of fish do you have?


I have 6 goldfish in there
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Mar 25, 2017 12:28 PM CST
Thread OP
Name: Kevin Langley
London UK (Zone 6b)
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.
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Mar 25, 2017 9:06 PM CST
Name: Beth
Greenwood, IN (Zone 6a)
Cat Lover Region: Indiana Miniature Gardening Vegetable Grower
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?
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Mar 25, 2017 9:22 PM CST
Name: Porkpal
Richmond, TX (Zone 9a)
Cat Lover Charter ATP Member Keeper of Poultry I was one of the first 300 contributors to the plant database! Dog Lover Keeps Horses
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Sure. It should be a safe source of nutrients for house plants too.
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Mar 25, 2017 10:58 PM CST
Name: Rj
Just S of the twin cities of M (Zone 4b)
Forum moderator Million Pollinator Garden Challenge Plant Identifier Garden Ideas: Level 1
So long as you do not use salt in your tank, I had several freshwater tanks that I always used salt in
As Yogi Berra said, “It's tough to make predictions, especially about the future.”
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Mar 25, 2017 11:13 PM CST
Name: Yardenman
Maryland (Zone 7a)
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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