You should ask in a forum called caudata.org which was also made by the founder of this forum John Clare. But in short---From reading that forum this is all I gather:
1)10 gallons is not enough for even one ADULT(always think of adult size)
2)Axos are territorial. Like pufferfish. If you want to keep them in a tank Id say a long tank 55g in MY OPINION is the best choice for a couple of axos.
3)Live plants and fake plants work well. Either way just make sure they have e nough hiding spots.
4)Use sand because its good for walking about on the bottom and if they swallow it; it passes through easily.

My tips(IMO):
-DO not EVER feed bloodworms, mealworms, superworms, beetles, crayfish.
-1 fully grown axolotl should be kept in a 20long tank. Because they are like turtles in this sense. They need space to roam around. Also look at how big they get. A 10gallon is just simply too small for one.
-If you want a pair I say a 40breeder would be okay, a 55g is best.
-Water should only be at most 1foot deep. It is best if its 5-7inches deep of water.
-Use canister filters
-Foods that you feed frogs work well for axos, but you can also add frozen fish like freshwater fish(trout). Turtle pellets(reptomin are best) also can be part of their diet.
-Dont just use one source of food.

I'd say your best bet is to go over to caudata.org and ask them and look at their caresheets. I may be wrong but I remember reading that they grow up to 12inches. So a tank that is 12inches long isnt the best idea for one. Two is just asking for trouble. Also keep the sides of the tank and the backside of the tank covered(suggestion).

Good luck and hope this helps.