CO2 is not a pill for the tank to swallow when problems arise. It is a completely different process, is complicated and brings with it a host of problems. I would be very cautious about "...getting some CO2.." as this can cause more troubles than it solves.I have add root tabs and have a fluva plant light above it I cleared out the plants above that were blocking any light only thing missing is co2 I will get some and see if that does anything
Thanks