I have about 20 1/2inch, give or take, in a twenty gal tank. ( i need to update my list) I had major problems with bacteria before they were all born. but they thrived as the older adults died off slowly

it was so sad. so now we have all these babies, which we realize are all going to get as big if not bigger than the 1 female we have left since the dramatic loss. she is starting to get harrassed by one of the "keeps getting fatter by the day" grown up fry-- I noticed today that she has nip marks on her dorsal fin, but the rest of her looks good, she eats, even though she has stayed slender-- i think she was one of the preggos when we got her. Anyways-- i'm just worried I guess and we are taking too long to set up our second tank--should i be worried-

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pH has been low since we got back from vacation-- i've been raising it slowly--weekly water changes--and we've been varying thier diet with freeze dried
brine shrimp. is she just out numbered

? LILA --sorry so lengthy