I would personally say no, unless both sides have different filtration. Also because 10 in a 10g is usually considered overstocking on it's own, and now it's really only giving them 5g of space. I'm no expert, and I'm sure someone who is will come along, but that's just my opinion :) Some shrimp would work, though, and they're pretty cool little guys!
55 Gallon: Crowley: Melanoid Axolotl; Mischa: Melanoid Axolotl; Achlys: Albino Axolotl; Eddard Stark: Leucistic Axolotl
Furry Friends: Daisy and Holly: Dogs; Norman and August: Cats; Gilbert and Mordecai: Guinea Pigs