Low o2 at night - The Planted Tank Forum
 
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post #1 of 7 (permalink) Old 10-23-2007, 12:57 AM Thread Starter
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Low o2 at night

Anyone else have this issue. Ive got a heavily planted 180g with all the gadgetry (CO2, UV, etc) and Im having issues with fish breathing at the top of the tank in the morning. Im assuming this is due to respiration from the plants pulling the O2 out of the water. Ive rigged a HOB filter on the front of the tank that runs at night..,..this has stopped the fish from being at the top of the tank each morning. The water parameters are fine.

Anyone else have this issue? Im thinking of putting an airpump on a timer opposite of my CO2 to combat this. Any thoughts would be appreciated.
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post #2 of 7 (permalink) Old 10-23-2007, 01:04 AM
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It sounds like it's the co2 reaching near-lethal levels at night. Surface agitation should prevent this (ie. the HOB, an airstone, raising a spraybar)

Mike


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post #3 of 7 (permalink) Old 10-23-2007, 02:02 AM
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you could put the CO2 on a timer then raise the spraybar befire lights out to diffuse CO2 still in the tank
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post #4 of 7 (permalink) Old 10-23-2007, 02:08 AM
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Is the CO2 on a timer/solenoid? Mine is, and I have it shut off when the lights turn off.

Your easiest fix is an air pump that runs opposite of the CO2 injection, rather than raising the spraybar for night, then lower for day, raise at night...etc

Quote:
Originally Posted by mpodolan View Post
It sounds like it's the co2 reaching near-lethal levels at night.
Keep in mind that CO2 and O2 levels are independent of each other; this is not a relationship where as CO2 increases, that O2 necessarily decreases. It may be situational that it occurs this way for this particular occasion, but an increase in one does not yield a decrease in the other.
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post #5 of 7 (permalink) Old 10-23-2007, 02:40 AM Thread Starter
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The CO2 is on a timer and has a pH controller as well. Shuts off about an hour before the lights and turns on about an hour after they turn on. I have zero surface agitation-the UV exhaust and the filters all point downwards to keep the CO2 from dispersing. Ill add the air pump on the timer opposite of the CO2. Thanks.
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post #6 of 7 (permalink) Old 10-23-2007, 02:43 AM
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The air pump is the best thing you can do. I ended up loosing most of my Discus tank because I was stupid and did that. Now it has the air pump on the timer with my lights and CO2.

Whats this green fuzzy stuff thats growing in my tank.
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post #7 of 7 (permalink) Old 10-23-2007, 12:54 PM
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Quote:
Originally Posted by fishman76092 View Post
I have zero surface agitation
While minimizing surface agitation is a good thing having ZERO can be a bad thing.
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