So I have an established 55gl tank with currently 5 dwarf neon rainbowfish,6 rummynose tetras, and 5 corys. I just got an order today of 3 female rainbows but they came significantly smaller than my other rainbows. I'm wondering if the larger rainbows will pick on them. I tried researching but nothing came up. I'm hoping that since there will be a school of 8 they will be okay. Let me know. Thanks.