As for the Excel, directions call for 5mL for every 50 gallons. Which is 1mL per 10 gallons. So for a 2.5g tank, you would dose 0.25 mL daily.
And for anything else, ferts can be broken down most simply to micros, macros, and carbon. Flourish would take care of he micros, excel the carbon, and then you would need a macro source.
If you haven't bought the flourish yet, I would recommend you reach out to NilocG on the forum. He makes ferts and has a liquid micro/macro combo pack that would likely take care of your tank for a few years since it's so small. Then you would just need excel and your all set.
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