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Discussion Starter · #1 ·
Hi,
I know many people have asked similar questions many times. But I can't find a reason for my specific problem so bear with me, please.

There is a medium sized tank, well established, well planted with good growth, moderate fishload with no overfeeding, Co2, big biofilter, no suspicious water parameters, no sicknesses, no nothing. On first, and second, sight everything's perfect.

But on more days than not the water is slightly cloudy (white, no particles) when the lights come on. It gets better as the day goes on, after around four or five hours the water will get clear, shortly before lights off it's short of crystal clear. The next day again the milky imperfection...

This cloudyness also persists after weekly waterchange for at least a whole day.

No cloudyness after fertilizing. No change if the night before the fish had no feeding.

I wonder what can be the reason for this strange behaviour of the tank's water?

Any ideas?

Thank you,
Nix
 

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Try increasing the water surface movement.
If that does not work, then try a larger water change routine, say 70% and note appearances of the water later in the week.

Clean any muck in the gravel, any dirt in the filter, scrub wood etc.

Then do the huge water change.

Now.........if that still does not work, try adding some Purigen and see if that helps.

Do this in this order.

Regards,
Tom Barr
 

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Discussion Starter · #5 ·
Thanks, I will do so.
Even when so far waterchanges did not seem to better it but sometimes even worse it (directly after it's worse).

I have done a 50 - 70% changing routinge anyway, for many months. :( The sand and gravel are reasonably clean but I will do more. And I can of course increase the movement of the surface. I have very, very little wood but I will check it again (I already did) for rotting.

I tried purigens already, chemical and natural (clay) with no effect. Should have said that. So far I thought I have done all that I can think of doing, that's why I'm asking here. :)

The reason especially eludes me, if it's a bacterial bloom. And why is it worse in the morning? What is in the ratios of light/CO2/O2 that makes the difference between night and day...

Without knowing anything, I suspect the difference is the O2, which is highest in the evening and lowest in the morning (I do have surface movement; I have no gasping fish, ever). Therefore increasing the surface movement sounds fine with me to try. But that idea contradicts with the increased cloudyness after waterchange, when oxygen is very high. Hmmm.

Thanks,
Nix
 

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Discussion Starter · #6 ·
Hello,

aside the remedy for it, has no one any idea about the possible reason? It's hard to prevent it in the future without knowing what causes it. Speculate away...

Thanks,
Nix
 

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Discussion Starter · #8 ·
Hi,

big biofilter -- I don't know if you know them, its a hamburg matt filter.
For a tank with my actual fish/plant ratio it might have become too large lately.

.Nix
 

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That still does not tell us nothing,
Do you have adequate media inside the filter?
How long has it been since a cleaning?
Been cleaned recently?
high flow/low flow etc...

It could actually be a number of things that may cause this cloudy effect, and I would assoiciate most of the cause with the filtration, and or a combo of that and a dirty or freshly cleaned sub, and or a water change/filter cleaning in the same day etc...

Or, you're tank is just now getting established/again from a recent drastic change/setup or for the first time...

Bottom line, something is messing with you bacteria colony.
 
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