
Everytime I swap to a new method, I come back to this a few weeks later. Never failed. Always produces pearling for the same CO2 injected even at very low lights. (8 watts on this 10 gallon tank.
Uses an internal filter with a long (preferably narrow) flow nozzle. You want flow intense at the nozzle.
Flow hits a co2 atomizer directly as close as possible. This chops up the micro bubbles to nano size and easily carries the current throughout the tank.
Very little CO2 lag time.
THis is the cheapest and most effective method I've found by far, nothing has come close.