Tysen, welcome to the forum. Check out
www.axolotl.org
You need freshwater test kits for ammonia, nitrite, nitrate to test your tankwater regularly especially if your tank is uncycled or just cycling. See:
http://www.caudata.org/cc/articles/cyclingEDK.shtml\
I would also suggest removing gravel if you have it in your tank, your axies will swallow a lot over time and it can take months to come out if it does, or at worst your axie will get a blockage or possible prolapse leading to death. Alternative substrate you can use is sand or none. If you choose to use river rocks you may find a buildup of gunk/waste between the rocks and underneath which could effect your tankwater parameters.
At that size they need to be fed daily, twice if they're hungry. Some Axies will tend to try and gorge themselves, so if you find any uneaten food or regurgitated food after an hour or so then cut back slightly on the amount you're feeding. You'll soon get the hang of it; takes a little time to adjust to their feeding and trying not to overfeed them.
Beefheart should be used occasionally. My sisters are round about that size and are fed mosquito larvae, baby earthworms (or chopped earthworm), live bloodworm (midge/sandfly larvae) and frozen bloodworm cube (thawed in a net, then dropped into their tank. I use beef/ox heart strips when I'm feeling a bit lazy about venturing out to my wormbins when it's cold but if you get worms they can be kept for several days in a container in the fridge. You may need to chop the worms up if they're large - start from the tail end and chop off bite sized bits. See:
http://www.caudata.org/cc/articles/worms.shtml.
The limb injury may very well have occurred at the petshop. As long as you feed them enough and have enough hiding spots and large enough tank) they should be fine.
Invest in a turkey baster if you can find one, these are great little cleaning tools that can be used for daily spot cleaning of uneaten/regurgitated food/waste and poo. Saves having to pull out the siphon.
(Message edited by kapo on April 23, 2007)