Hazy Tank Water - Page 2 - Tropical Fish Keeping - Aquarium fish care and resources
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post #11 of 11 Old 06-20-2013, 11:58 AM
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Originally Posted by DanielaMarie View Post
I don't usually vacuum the gravel with the water change but it was looking dirtier than usual. It does look slightly better today than it did yesterday.
For the future, if you are going to vacuum the substrate (gravel, sand, etc), do it at every water change. But I don't mean digging down to the tank floor all over. My point is that regular "cleaning"at whatever level is much better than only doing it once in a month and then doing more. There is quite a complex biological process going on in the substrate involving organics (fish waste, etc) and many types of bacteria. If this runs properly, it will be a healthier environment for the fish. So any disturbance of the substrate should be regular.

The cloudiness may have been stirred up microscopic particulate matter, or it may have been a small bacterial bloom. The latter is very common if the filter is cleaned. But both are harmless (usually) and will clear as you are noticing.

Sanguinefox's comment on the source water and rain is well taken (though not applicable here). It doesn't happen now where I am living, but several years ago I used to get very cloudy water after every water change in mid-spring and autumn due to sediment from rain runoff in the reservoirs that was so great it couldn't all be filtered out. After a water change, I could not see the back of the tank, and that is no exaggeration. It took 2-3 days to clear. Harmless, but very annoying.


Byron Hosking, BMus, MA
Vancouver, BC, Canada

The aquarist is one who must learn the ways of the biologist, the chemist, and the veterinarian. [unknown source]

Something we all need to remember: The fish you've acquired was quite happy not being owned by you, minding its own business. If you’re going to take it under your wing then you’re responsible for it. Every aspect of its life is under your control, from water quality and temperature to swimming space. [Nathan Hill in PFK]
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