Quote:
Originally Posted by Aquattro
The thing with oxygen is not adding it, but removing CO2. any water surface movement should off gas the CO2 in the system, making the water absorb more O2. If the power heads were causing any type of water surface movement, you should have been fine. Lots of tanks run without a skimmer at all, and do just fine. Not sure what to look for, but I can't see this being from the skimmer turning off.
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I have a skimmerless tank too and ya it has done just fine. Thankfully it is not my primary source of oxygen or surface agitation on that tank tho and there aren't a lot of fish in there. But, what if a tank had it's powerheads pointing down and there was little to no surface agitation? It looked to me like the skimmer was the only thing agitating the surface and as you said, CO2 needs to exhaust from the tank as well. Loss off primary oxygen source and surface agitation to expel excess CO2 to me spells doom. I don't see why the loss of a skimmer CAN'T be the cause. Sure, there MAY have been some other cause but given the facts we know, the skimmer seems to me to be the most likely culprit by making the least number of add assumptions. Fish are perfectly fine one day, then skimmer dies over night, fish dead the next day.. No, can't be the skimmer??
I realize that a lot of people, myself included run skimmerless just fine but I don't see that being the point here. My skimmerless tank and your skimmerless tank is not the same as this skimmerless tank. We all know perfectly well that every single tank is different. Two people could be running the exact same setup but still get different results. Just because you are successful without a skimmer doesn't mean another tank without a skimmer will be equally successful. The same applies to pretty much everything in this hobby, biopellets, zeovit, salt brands, RO water vs tap water, etc..