Guppy keeps on getting sick in main tank

Gr198868
Member
I have a 20g tank with about 8 guppies in it, one of my guppies got sick a while ago and after I treated her she was never the same, she always was more lethargic and never got pregnant again, all of my other fish seem perfectly happy and healthy but something is off with this one. She kept on getting sick in the main tank and so now she lives in a 3.5 gallon tank I had laying around. Shes by herself and she seems a lot happier and healthier, whats causing her to become sick in the other tank if none of the other fish ever get sick? Im probably going to keep her in the 3.5 gallon from now on, I keep it very clean and do a water change every other day but it would be nice if I could put her back in the 20g
 
Pfrozen
Member
what are the params in the 20 including gh and kh
 
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Gr198868
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