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CO2 levels.....

Ok, so my PH is 7.5, KH 4 degrees, GH 8 degrees, ammonia, nitrate, nitrite 
are all 0.  I have crushed coral in my canister filter to try and raise the 
KH, and have managed to get it up to 4, it was 0.

With the figures I have my CO2 levels are sub-prime.  What can I do to 
raise them??

My CO2 is a DIY and I am getting one big bubble every 2-3 seconds.  This 
feeds into a wood airstone that is placed below my filter intake.

Semper Fi