Hello! My tank has 3 sword tails, 2 Neon Tetra, 2 Roseline sharks, and 9 kuhli loaches, as well as a couple of snails, it has some plants and a few aquarium ornaments. I plan on getting more sword tails, to get a better male to female ratio, as well as more plants, I want to get it heavily planted. Today, I added 2 red tail black sharks that my parents got me as a gift cause they liked how they look. I must admit that I love how the new red tails look, but I'm a bit scared that with time they will get more aggressive and possibly harm the rest of my fish. This is the only tank I have. For now all seems fine, but I have read that the red tails get quite aggressive when they settle in the tank. I would like to know if anyone here has experience with these fish and what they recommend, I have had fish for most of my life but usually one or 2 species at a time and in very small numbers. all my fish have played well with each other up to this point and I would like to keep the harmony in my tank. I was wondering if I can keep both sharks or reduce the number down to 1? or if I should wait and see how they behave in the future?