The day you add the CO2
should be the day you remove the bio wheel. Bio wheels create too much surface agitation, which causes your CO2
to exit the water before the plants really get a chance to use it. My preferred HOB
filter for planted tanks is the AquaClear series, as their return seems to agitate the water less, you can lower the flow rate, they don't have biowheels, and you can easily extend the return ramp down into the water, so that you have zero surface agitation.