12-20-2008, 08:37 AM
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Originally Posted by iamntbatman
Bacterial blooms are pretty normal for a cycling tank and since you don't have any fish in there, there's no need to worry.
However, for future reference the bacteria that cause these blooms use oxygen as part of their metabolic cycle, just like fish and other aerobic organisms do. A population explosion like that can seriously deplete oxygen levels in a fish tank. I recently had a bloom on an established tank (I still can't put my finger on why). I did a 60% or so water change as soon as I discovered it, another 50% change a few hours later right before I went to bed, and by the time I woke up in the morning the water was milky again and two fish had died. One water change later, the water was back to normal and the other fish fine. So in other words...these blooms can be serious on stocked tanks.
That happened to me once too. I think mine was related to dosing meds though. I noticed it at night time and did a 50% water change, turned the airstone on (that darn thing is so loud! kind of made it hard to sleep!), did another 50% change in the morning, and by afternoon all was clear. And, even though my fish were already compromised they all made it.