I'm not feeling happy about this weird rasbora, it sounds like more than "air gulping" to me...& that's not something I totally buy into with rasboras, goldies maybe...is the white at the fin/body juncture?
Cool about the free tanks! Bleach, rinse, maybe a wipe of rubbing alcohol & more rinsing.
I had a wonderful lfs when I lived in MA. Uncle Ned, his brother & the catfish/puffer guy were great! It was a mutually beneficial relationship. They stocked unusual fish & traded food for my plants & sometimes there was a free tank, etc, involved. I miss them...good fish talk too if they weren't busy. I don't have that here, sniff, but an awesome plant club now!