You had your tanks set up for 2 weeks which is not enough time for your tank to cycle. Read the following link:
http://www.caudata.org/cc/articles/cyclingEDK.shtml
The two main things that you have to worry about are tank temperature and water quality, at this stage. These two will effect your axies.
Firstly water quality . Make sure you read the above article, its extremely important. Your tank is currently going through a cycle, which can take several weeks. Setting it up for 2 weeks doesn't do anything unless you borrowed old filter media from an established tank to kickstart the cycle.
Once you added your axies, effectively, you started to cycle your tank, through feeding them and the axolotl waste produced. This can lead to unsafe levels of ammonia, which need to be controlled through daily waterchanges (at least 20-30) until your tank is cycled.
Don't add chemicals or other stuff that will fix/bind/clear up the ammonia or nitrite as this will stuff your cycling up.
Hope you're not confused!
How often are you doing water changes? If once a week, start doing it daily - this will keep it safe for your axies to live in it. Also get the tankwater tested at a petshop and get the results and keep a record of it, or buy freshwater test kits for ammonia, nitrite and nitrate and test it yourself regularly.
Also, when you feed them, do you clean out any waste, if found, or uneaten food straight away (within an hour if there's any left over)? The best daily spot cleaner to invest in is a turkey baster, you can suck up all the nitty gritty bits!
What is your tank temperature? Axolotls do prefer cooler temperatures, so you need to try and keep it well below 24C, preferably below 20C to keep them stress free.
Ideally, axolotls prefer earthworms if you can get them. YOu shouldn't use meat as a staple, but if you can't find worms, try bloodworm cube (they're frozen and need to be thawed and rinsed before placing in tank, some people place on a plate/small glass candle holder in their tank as it can get buried in their substrate); live crickets; or alternatively, raw fish, raw meat (ox heart/snitzel/beef/ox liver/chicken/sheep heart/liver cut into thin wormlike strips - cut all fat and tendons off b4 feeding).
I feed my babies live food, just throw it in and they catch it (but they're small and eat live bloodworm, mozzy larvae, daphnia, baby earthworms). I feed my sister's earthworms but I know she occasionally will feed hers thin strips of ox heart. You don't have to handfeed you can try using long tweezers or try dropping it above them or try a bamboo skewer (probably won't work with the cube tho,but work's great with worms, as they're long enough to squirm round; and axies don't get skewered you soon get used to angling the stick so they just grab the food!)
The lack of appetite could be a combination of settling in, the tank temperature and water quality.