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Discussion Starter #1
I'm attempting to inject CO2 into my filter. I have all the correct supplies and I have already built the 2-liter with the tube. The only problem that I have run into is that the sealant that I used to keep the CO2 for just releasing into the air from the 2-liter is All Purpose Adhesive Caulk plus SILICONE. Now, I have heard that most silicone caulk contains an anti-mold chemical that can kill my fish. So i was wondering if this would be OK because it's not going IN the tank it is just sitting dry at the top of the 2-liter bottle?
 

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I would think it would be ok since there would be no contact with the tank or anything going into it. I always use the GE Silicone I just to avoid this though. ;o)
 

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You do not need sealant. Just make the hole smaller than the tubing. Cut the tubing at a sharp angle and pull it through the small hole with pliers. It will provide a better seal than sealant.
 
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