Other than being pruned rather dramatically, as raee puts it, it doesn't look bad. How far is it from that wall? It may have lost some leaves if it wasn't fertilized, but a little fertilizer will fix that. The leaves are pretty large, so it may be an orange, but don't hold me to that. The leaves on my lemon are pretty big, too. You'll have to wait until it blooms, then post pics, they lemons and oranges are different colors. If that doesn't work, you'll have to wait until it develops fruit. Sorry.

I think you got yourself a leaf miner infestation... treat with spinosad or neem oil on cooler evenings, They also sell systemic pesticides called imidacloprid.. Bayer sells it.

OK, from what I read, it mostly peat and has a little perlite..But no bark... If it were me, I would make sure to re pot into a pot just one size up from the root ball so it dries out faster and make sure to flush at least twice a month with fresh water...If you find that the mix is still holding moisture more than 5 days, then I would re pot it into a clay pot....This will force you to water more frequently since it will dry out faster, help prevent rot, and allow you to flush your mix from all the salt deposits more often..It will also force you to re pot every few months before the mix compacts again....Re potting again will not hurt, just make sure you remove as much as the old mix as possible carefully... If you can find bark as Laura suggested, even better! I would leave the dirt out of your mix and just use the bagged...............Glad you came here for help..Hopefully you will stick around and let us know how it goes. Can you take a pic of the ingredients in the fertilizer? I looked that up and it does not say at all..

A two year old lemon tree should be about 2 to 3 feet high. Are you fertilizing the trees? They are "growing" in much too large of a container, and as Johnmerr pointed out you have them in a poor light situation. Citrus require fertilizers with higher levels of both nitrogen and potassium. You can use organic fertilizers if you wish, but citrus perform much better with conventional fertilizers. Wishing a good future to these trees.