As I have the same issue with above plant every time I give it a go I thought it may be the time to eventually try to do something about it. Basically every time I plant this Rotala in my tank, as soon as it starts growing it immediately changes the appearance which I don't really like (I don't mean unhealthy). Leaves become more green rather than reddish, rather than thin needle shape they become rounded and what bothers me the most, they are about 3 times bigger than on the original plants. It slowly starts looking more like lettuce than Rotala. It has started shooting new stems even without trimming. Also some of them start getting stunt tipps. I have high co2 and light level, good water circulation and tried branded ferts same as EI. To me it looks more that the plants get too much of something rather than not enough but I would like to see what you guys think. That's how it changed within 12 days from planting - compare bottom parts of the stemms to a new growth. Let me know what you think.