which fish

Hi, looking for opinions. This is my 38 gallon planted tank and looking to add one more fish species to complete it. Here's what I have: 9 green neon tetras 10 black phantom tetras Amano and red rili shrimp kept at 74-78 degrees 2 HOB Aquaclear 20 filters pH 6.4 GH 300ppm I'm thinking either 2...