[Goldfinger]

Done a water change last week on our fish tank and over night, the water changed to a nice shade of pink!  :blink:   

Not a clue why, the fish didn't seemed to be bothered, if anything, they looked more 'sparkley' / brighter coloured.

Did another change at the weekend and again, the water is slowly changing to pink. 

There's no water mains work going on anywhere around us (that we know of), so...

Any Ideas??.................. 

[arugula]

What gravel, stones, toys or ornaments etc do you have in the tank? I'm wondering about colour leaching.. Something you've recently changed or installed?

[Goldfinger]

No ornaments or sand have been changed, just the water... 

We took out only about three quarters volume of water, and we even left the fish in!

[Raven81]

I have no idea but my only suggestion is have you changed the food to something that could change the colour?

[Goldfinger]

Nope, no food change either....

Got you all boggled       haven't I?   

[arugula]

Ok then, what you done? 

So, my brain doesn't feel like being that chemically minded right now, but would a change in the chlorination/fluorination of your local water supply react with something in the tank? 

[Goldfinger]

Must be the water supply then.

It's got me beat too.

As long as the fish aren't suffering.....

[arugula]

And your filter system is clean and or up-to-date with replacements parts if necessary?

[spottymint]

Any change to the feeding of the fish ? In other words, feeding more food or more frequently ?

What colour is the soil around your parts ?

I ask as someone had a horse which came up from Cornwall/Devon way, the horse was grey with a pink tinge, took many a bath to wash her clean. The soil in them parts is very red, maybe something in the water.

[mumofstig]

algae?

[grinling]

Can you put 1-2 gallons of water in a clear container and see if that changes colour. Microbes in the fish tank might have reacted with something unsual in the tap water.

[ANHBUC]

You could try collecting some fresh rain water to use next time to see if that does the same.  A call to your local Water Authority might be worth while as they might know what is causing it.  If they don't they might need to check your supply is ok.

[Raven81]

I don't have any more suggestions but having googled "pink fish tank water" this seems to be quite a common problem - to which so far I haven't found an answer but thought it would be worth mentioning.

[ANHBUC]

I had the same idea Raven81 and could only find this one which was an ornament that had started to break down.  See page 2

www.fishforums.net/index.php?/topic/372506-tank-water-pink/page__st__20

[tosca100]

Any bogwood in the tank?