It's really hard to tell the gender of Hillstream Loaches Since them have no outward sexual differences.
It's been suggested that males have a stronger coloration but that's not a dependable way to sex them either.
Your tank is approx a 30 gallon with a pretty stocked to over stocked list of fish.
Hillstreams have different tank requirements than most of those fish, most notably heavy water flow and cooler water temperatures(65- 75F).
In order to possibly breed them you would need to have several HS so they can pair up along with being more comfortable being with others of their own kind. Perhaps it would be better to wait until you can dedicate a tank to just them and their needs before buying more.
Oh yes Welcome to FishLore!
Maybe I'll leave the second one then, would have been nice to try and breed them though. As for the stocking, my LFS said what I have is okay, although some of the baby Panda Cories are going to be given to a friend soon.