So I started out with my 10 gallon betta fish sorority with 4 girls. Recently, one of them died due to internal damages, so I'm left with only 3. I know that 4 is the least you could go, and 5 would be recommended. I want to get more bettas to add to my tank to spread out the aggression, but I'm not exactly sure how. I know I shouldn't add one fish to the tank because my 3 original girls would most likely kill her. So I was thinking of adding 3 more? I know odd numbers are best but I want to add enough fish to balance everything out without overstocking. Any advice on how to introduce my fish or how many I should get?