Basically Rotala's need alot of Nitrate, Iron, Calcium and Magnesium to make them grow well, also Potassium to make the plants open their mouth to consume. More lighting, it does help but you need alot of nutrients to supplement them, more light you have, you'll see more obvious sign of deficiency symptoms of your plants as it need more nutrients to catch up with. 3-3.5wpg is good enough. Actually rotala's species need little light it still can grow well, is the balance of nutrients and condition that you provide them.
Cheers
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