I'm using the ARM media. I have it in a 6" tube and I have about 8 inches of media. Because I had a sponge in the bottom at one point, I had some very fine sediment, maybe it's still in there and this is what is continuing to cause the problem. I'm just too lazy to change the media to test this theory. I still think I have an access of CO2 maybe.
Lee
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Need more time for the tank... Break a leg!
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