You'll want to dose potassium, nitrates, and a micro nutrient mix like regular Flourish. The Seachem line would be fine for a 3g and would last a while. You may have order them online though if your LFS don't carry them. You have DIY and good light so it has a good chance. Make sure you change out your DIY mix frequently (about every 3 weeks) so you have steady co2 production.
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*Kristin*
5 Planted tanks:
55g, 40g, 29g, 10g, 5.5g
10g N. multifasciatus tank, 5.5g Platy fry
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