EI dosing could be reduced, but it doesn't need to be; unless you have a high fish load also contributing to nutrient levels.
Thanks for the advice. Unfortunately the T5 fixture won't operate without both bulbs in there. How much does duckweed reduce lighting? I live in Oregon and we have plenty of duckweed in our steams. I was thinking about keeping some in there to reduce the amount of light that hits my tank.
Also I performed your H2O2/Excel method today and I must say thanks a lot for posting that! I already see it dieing off and the rest is still reacting (bubbling). I will be taking the cories out and deploying another Otto mid week.