air in tank

rbishop said:
Any body have some unbiased documentation that a bubble traveling thru water can't exchange gases...
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verrrrrrrrrrry good question. I also would be interested in any such information.

when I had a lot more fish in my set-up, I decided to take out the bubble wand because I didn't like the look. Fish began demonstrating signs of oxygen deprivation within an hour.

I replaced the bubble wand, ran it into the spray bar, so that the bubbles reaching the surface were being driven out and down and broken up as micro bubbles. Symptoms alleviated within 30 mins.
 
If your running an airline anyway a sponge filter is better than a bubble wand.Hydor brand make smaller streams of bubbles than most sponge filters.Gives you a back-up filter or a filter that will instantley cycle a quaratine or hospital tank.
 
i always thought it was silly to think there would be no oxygene transfered via airbubbles. if the air is passing through the water it should work just the same as water passing through the air when it comes out of the hob. that's just my opinion though and i don't have any proof or means to carry out such an experiment. i'd like to see a paper on this subject if one is found.
 
I noted the same thing, I run a 12 inch bubble wall in my 46 gallon. I turned it off overnight and the fish were gasping at the surface and obviously distressed. Turned it back on and they perked back up quick. Plenty of surface agitation from the spray bar submerged but tilted up.

I figured it was because I have a very tight fitting glass lid with less than a 1/4" air gap around the filter tubes to cut down on evaporation. So not enough oxygen exchange in the air over the water. Bubble wall constantly puts fresh air in the gap between the lid and the water.

Robert
 
Cory Keeper said:
interesting observation Coler, did you have any other surface agitation?
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Yes. In both instances, i.e. both with and without the bubble wand, I was running a spray bar and a separate filter outlet to disrupt the surface of the water, one each side of the tank.

I think the more interesting observations are the statements that oxygen is not exchanged into the water via an air stone/bubble want/whatever - never seen a single thing to back this up that is not a matter of opinion.
 
While the bubbles are not needed provided there is adequate surface area for the tank loading, or additional agitation provided by surface disruption, I feel they have a benefit.

Some folks just do not like the lokk of bubbles, or the noise of the air pump or bubbles breaking the surface. A lot of personal choice that doesn't lead to any solid
definition that they do not help.

In any case, the water will only reach a certain saturation level via whatever means the exchnage happens.

i agree, Coler....no real evidence to say it doesn't happen.
 
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