Ok, so I was cleaning my tank and had my original betta girl in a bowl next to the sink I was soak the ornaments in and walked away for a few mins and came back to a dead fishy, :( however it was the last day of my 30days on my reciept so I went to exchange her but I ended up buying 4 baby bettas. I let them float in the cups for a few days and released in them into my 10gal, the smallest of them was getting picked on so I took him/her out and put her back into the cup. No one has died, they do chase each other for a min or two and then leave each other alone, I have one that's bigger than the rest that is definately the dominant one of the group. Today I let the little one back into the tank, no problems so far. My question is since they are still young and I don't really know what the sex of them is but they are not killing each other now will they in the future? Do they get more aggresive as they get older?