1) Since it's just a Nano GEX tank, what options (additivies) can I get (what brand & roughly how much it'll cost?) to let the plant gain back its redness?
Ans: For 1ft and below i would recommend at least 18W, ADA mini tank the lighting is already 27W, guess Amano knows it need that much. When you increase light, you need to increase CO2, ferts etc... Rotala needs strong light, iron and potassium to become red.
2) If this tank has shrimps (Cherries, Sakura, Taiwan, CRS) in them, anything I need to take care of or must avoid
Ans: Cherries and Sakura are pretty strong, i using EI method ferts method with high CO2 and they are ok, CRS i'm not sure as i haven keep CRS before so i cant tell you.
3) Just using the default GEX PL light, is it enough to drive or maintain the redness of this plant?
Ans: See Question 1 answer.
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