Aeration with cannister and co2

kimmisc

kimmisc

is in your closet.
Mar 12, 2007
963
0
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51
Florence, SC
I receive my Fluval cannister today. :clap:

On a 29g with the Fluval 350 and 3 bottles of DIY CO2 (currently running through a hagen ladder but I might switch it to filter intake), should there be an airstone left running at all times for aeration now?

Will sticking the CO2 into the filter intake be possible without there being a big opening left for snails and such to crawl into? Kinda afraid fish and snails will get sucked into it alot.
 
Thanks Mg.. I currently have an airstone on my lighting timer to come on at night. I'll just leave it as is.
 
I just shove the co2 line in between the slats on the filter intake. Therefore there is no increased opening as opposed to leaving it stock.

An airstone would be needed if you had 1. too much co2, or 2. not enough oxygen.

With diy it's unlikely you will end up with co2 levels high enough to cause co2 poisoning.

With enough plants, even with very little circulation, you should also have enough oxygen. Plants give off oxygen.

So I don't see any particular need for an airstone in your setup.
 
Direct the filter outlet upwards so it generates a gentle ripple effect but not splashing, that should ensure enough O2 diffusion without the need of an airstone.
 
You risk having your mixture sucked into the tank if you put the output directly in the intake. I would put an airstone on the end of the line and then put the airstone just below the intake.
 
I was worried about that too, but there's not that much suction there, at least on my filters. It still requires backpressure. The water is still rushing past the hose so if there's no backpressure it just pulls more water rather than pulling co2. It has the added advantage of not requiring as much backpressure to overcome as if the airstone were just in the tank. If the hose were more restricted it could become an issue maybe on more powerful filters, but even if I hooked it up so that all water flow was blocked off, I have serious doubts that the filter itself would collapse the 2L bottles to the point where it would actually suck in solution. You would have to have some amazing suction there to do that.
 
I just stuck the tube through the slits in the intake assembly. The intake assembly on this thing is huge, and the co2 tubing is pointing downward. There's no way it's going to suck mixture out of bottles.

Now I have little microbubbles in the tank all over. :headshake2: Guess I'm going to stick with this. Snails kept interfering with my ladder.
 
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