My Platy momma had 12 fry a week and a half ago. Since the birth she has been lethargic, clamped fins, staying on the bottom. She does come out to eat. For a while she was also a bit bent but has straightened. She looked better yesterday but then regressed a bit. Any tips to help her get back to herself? I don't know if this was her first batch but it's her first batch with me. 20 gal high, water is 0 ammonia, 0 nitrites, 40 nitrates.