Help! DIY CO2 system o/d; fish still dying 24hrs later - Page 2 - The Planted Tank Forum
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post #16 of 19 (permalink) Old 03-04-2009, 02:15 AM
Planted Tank Guru
Join Date: Sep 2006
Location: Northern California
Posts: 9,417
Originally Posted by tominator View Post
Sorry, this is an older thread but if I am reading this correctly than your 2L bottle is above the tank. I believe that this would allow the mix in the bottle to siphon into your tank, it goes from high to low position, thus when you do a water change you put the end of the syphon tube below and not above the tank. As mentioned earlier a check valve won't do anything for keeping the mix out of the tank, but will keep the tank water out of the mix. If you do have a check valve it's probably best to put the bottle below the tank and the check valve will keep the tank water out of the bottle and gravity will keep the co2 mix out of your aquarium.
Don't forget to use a gas separator too.
epicfish is offline  
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post #17 of 19 (permalink) Old 03-04-2009, 03:27 AM
Algae Grower
Join Date: Feb 2009
Location: Fairfax, VA USA
Posts: 7
what kind of silicone did you use, and did you let it completely dry and off-gas before you installed it?
Some types of silicone sealants off gas some nasty stuff (ammonia, probably formaldehyde, etc.) that you don't want in your aquarium.
timo96 is offline  
post #18 of 19 (permalink) Old 03-04-2009, 03:32 AM Thread Starter
Algae Grower
Join Date: Feb 2009
Location: Australia
Posts: 11
No silicone sealant in my CO2 setup. I dabbled with it early on when trying to get a good seal for the airline running into the yeast bottle, but it didn't work so I ditched it in favour of a rubber gasket connector made for me by the guy in my local brewing/hydroponics store.
Nimbus is offline  
post #19 of 19 (permalink) Old 03-04-2009, 01:37 PM
Planted Tank Enthusiast
Join Date: Jan 2009
Location: Medford, MA
Posts: 683
I agree with nimbus. I never really believed I could get the silicone stuff air-tight. I am using standard pneumatic fittings that are definitely air-tight...
Regloh is offline  

co2, diy, overdose

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