I was afraid of damage to the impeller as well as find the noise anoying, so I went to lowes and found metal pipe fittings, about 5 or 6 of them that would all screw together, and fit inbetween the 5/8 in hose on the output of the canister. The 3rd fitting allows the small air line tubing to connect into the middle of the 5/8 ones, allowing you to pump the co2 right into the stream. I found that by the time it gets to the spray bar, it is almost 100% absorbed. I will get a small amount of co2 bubbles, just like I did when I was running a glass diffuser. Now I have less stuff in my tank, works great.
My 75g Amazon Discus Tank:
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