I want help stocking my 10 gallon walstad(kinda) outdoor mini pond

I have an outdoor mini pond setup which is kinda walstad but I'd not say truly because it depends on a heater (wanted to keep tropical fish plus I cannot find cold water fish like white cloud mountain minnows locally), a sponge filter and artificial light because its in a shaded area. It's planted well, not dense yet but will be dense once the plants start growing out. I have 2 neocaridina and 6 medium sized mollies(I'll rehome most or all of them if I have to), and I'm going to get more neocaridina and I was hoping of getting a small school of cardinal tetras but was going for neon tetras at first but I like cardinals more and I've heard about neon tetra disease but I can still go for neons if cardinals aren't possible, what can the maximum number of them be and what would be the sweet spot amount be along with some of the mollies. I was planning on amano shrimp but then i heard the horror stories of those escape artists so had to drop that plan since its no lid. And the pond also has hydroponic plants(mostly house plants like pothos) growing with their roots submerged and established for extra bio filtration. (Need the fish to thrive!!!)