Water circulation, 295 GPH filtration, co2 diffuser 3in1
This is how efficiently you can use a powerhead Co2 goes thru tubing and water pressure breaks it into small bubbles which easily disolve in the water. It isn’t the most effcient way of distributing co2 in your aquarium, but on my 40 gallons breader with 3 bubbles per sec I have ph 6.8 and gh/kh 5/6 co2 around 30ppm. Those double sponges (3 of them) I ordered from China for like 3-4 usd for all of them.
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