Using a "medium tech" setup on my 7.5g. Got the Neo Co2 kit up and running yesterday. The flow isn't as crazy as I have seen in some videos, thankfully, but yeah my concern lies with the duckweed floating above. I've noticed bubbles accumulating underneath some of the weed that has planted itself in that area. Is this prohibiting proper dispersal of the co2 to the tank or am I just worrying about nothing? I've been told by some people that having the diffuser near the filter, or the outflow at least is the best positioning. For aesthetic purposes I placed it on the left side of my tank whereas the filter is in the center. Should I move it?