I doubt that the microbubbles reach the whole tank, but the CO2 enriched water certainly does. The flow from that powerhead is huge for a 29 gallon tank. It seems, at times, to turn the tank into a whirlpool! Ok, I exaggerate, but there is a lot of flow in that tank, so the bubbles reach everything except the far corners. I have to admit that my DIY genes are now excited again, and I am pondering making a small spraybar to spray the water down the length of the tank at the front, so the water returns along the back, hopefully without quite the whirlpool effect. The much higher flow rate than I previously had, in the same diameter outlet pipe might prevent the algae growth inside it and the coalescing of CO2 bubbles.