I have a 15 gallon tank with my female betta in. I also have 3 adult female guppies in there and 8-10 fry which are a month or so old (these are in a breeder net together). Yesterday i chose my biggest fry which was 2-3 months old and put him in the main tank with my females but my female betta killed him. This isn't the first time she's been aggressive, shes shredded tails before etc. Anyway, my plan is to put all my guppies AND fry together into the new tank i have (cycled of course) and wait a while. In 2-5 months time when the fry are adults and strong, i would really like to add my female betta in there. Would she have forgotten about them and would she be kind/peaceful once again like she was when i got her from the pet store? I don't really want to keep her in the current tank as it is in an annoying place in my house AND it isnt the best for her (it's loud, old and barely any gravel and very few plants, and no air stones unlike my other tank).