fish tank pump stopped working-drooping leaves

the plant is about 2 1/2 weeks old it was doing great in a 5 gallon dwc. The air seemed week by the second feeding and leaves were droopy as if they didn't have enough water. Went to wall-mart replaced pump. the bottom leaves are pale and dry the next set are droopy and thin while the top set looks to have recovered. The next day bottom are leaves were crispy and I removed them the next set is still curled down but not dead yet. should I leave alone or what. Using 25/ml of one part gh grow. Any help is appreciated.

thanks

Check your pH. Without pics, hard to tell; symptoms sound like pH issue.