Generally I would say that if there isn't a problem, then don't fix it. Since you have fairly high light, and co2 injection, your plants may need more potassium, phosphate, and maybe even micro's than they are getting. I can't really say what they are getting from the root tabs, because I have never used them. Do you have a phosphate test kit?
Standard 10 Gallon (20 x12x12).
Low tech, Sand substrate.
Eheim 2211, and Aqueon Quietflow 10.
Finnex Stingray LED, 20" above substrate
2 Anubias Nana Petite, Christmas moss.
4 Halequin Rasborahs, 5 RCS.