Glosso would be a good choice, it can grow well in non-Co2 injected tanks and should grow abit faster with Excel dosing, but do make sure the light intensity is also sufficient to support the growth too.
Hairgrass can also be used, but it tends to be a very slow grower in a non-Co2 injected tank. Tennelus would also grow slow in that environment too, and it usually needs a fair amount of light to grow.
For your 10+ liter tank volume, the daily Excel dosage would be quite small, like only 0.25ml if based on their 5ml per 200 liter recommendation... have to use dropper to measure that tiny amount, though i guess you could dose 0.5ml daily and still be okay. Your bottle of Excel will last for a very long time.
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