Welcome to planted nano tanks! Perhaps the cheapest way of getting carbon into that tank would be to buy a 250ml bottle of Flourish Excel ($5-$7). The wpg rule does not really apply to nano tanks. While 14 watts will grow the hornwort and sword plant, many plants you may try to grow will most likely be limited by your lighting rather than CO2. Once you get things growing in the tank, you may want to replace the hornwort and sword with more nano friendly plants like mosses, anubias nana, and small stems....just a thought.
Eheim Pimp #181
29g High-tech jungle
5.5g Low-tech jungle
2.5g x 2 Low-tech shrimp and moss
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