This is a bad time for Aloe, they are in flower here in Calif. but not the Madagascar species. Growing in the house is not their thing, and they hate our cold winters. I don't water mine this time of year, because they are mostly from below the equator and it is then the wrong season for them, I will start to water in April, and fertilize. Most spots on Aloe are either scale or cold water. I really couldn't see your picture well enough to decide. Mine just don't get this problem. Mainly your problem you are growing a plant that ususally does do well in New York, it like dry, warm locations, and very fast draining soil. Lots of sun. Your are going to need to make your own evaluations with the conditions you are growing yours. Do you have any other plants in the house that could be effecting this plant? Do you bring any new plants in recently? A lot of considerations. When you water make sure the water is warm. I hope you get some clues to help you. Norma

Tho' Crown of Thorns (Euphorbia milii) is a succulent, they like a lot of water, more than you think they would. I grow a number of these, I give them the best light I have (west windows), ample water (til it flows out the bottom, I do mine once a week) & fertilizer May thru Oct. (several of mine bloom a couple of times a year, once stays in bloom almost all year). It's characteristic of them to have most of their leaves up top, but yours should also have some along the stems. As you step up light & water, it should get leavier. The unknown plant is a Haworthia (can't say which), it's sort of closed up I'm guessing due to lack of water, water it more, it should green up a bit (rather than the gray/green it is now). The new plants are another Haworthia, a common one, fasciata or attentuata maybe, check some picture sites for IDs. Haworthias do not want strong light, they pefer medium light, I'd say yours are fine w/ that. I grow my Haworthias on the outer edges of my windowsills, they don't need the strongest light & some actually prefer it on the shadier side. The last plant is a cactus (I don't grow any so can't say which), that fake straw flower on top should be removed, it's glued on, not sure how to take it off. I didn't look at the Jades. The Tiger Aloe grows like that, there's nothing wrong w/ it, but yes, could use more light. I might even re-pot that a bit smaller. That Aloe that's spreading out from the center, needs something, if it were mine I'd cut them all off an inch below the leaves & pot them in DRY soil to re-root them. They're not going to recover from that, their lower stems aren't going to leaf out again, might as well re-root them. All your plants look far too dry, also the mix looks too hard. What are you using for dirt? I'd start over w/ fresh cactus & succulent mix, w/ abt 30-40% perlite added for fast drainage. This way when you water, they'll be able to drink & then it'll drain fast. I suspect your mix is so hard that they're not able to drink much no matter how much you water, tho' suspect you're watering too little. You might try reading around on the Web to learn the care for these plants individually. In my opinion, if you only have east windows, focus on Haworthias & Gasterias, I'd forget abt the Aloes altogether, you simply don't have enough light, it'll always be a struggle for them.

Most Aloes that I know of take on a bronzy red cast in summer with the more intense sun. And they are quite summer drounght tolerant. Too much water can cause them to rot. Joe

Look for Soft unhealthy roots Or roots that look dehydrated. They might have rotted and then died and then dried up.. I would cut them off if you see them . Healthy roots look totally different. Some times the big guys can be bright yellow, especially on the tips. Then I would dust the roots with cinnamon ( a fungicide)let my plant rest and callus those roots in the shade , Not in dirt for several days and then replant making sure the dirt has drainage. After planting , DO NOT WATER. wait a week or at least a half week and then water. The roots if bruised in the planting process need time to heal or you introduce rot and more dead roots. If there are no roots plant and don't water till one feels resistance. I might plant it in a VERY well draining mix in a pot till it has formed roots and then plant. don't water , mist till the roots have formed. That could be a month or two.One might look at the condition of the stalk. One might need to cut the stalk back to where there is good healthy tissue. Dust with cinnamon and proceed in the pot. Some people will root tree aloes in a pot of rocks that they water. It creates a environment of hummidity and perfect drainage. It is hard to say what is going on with the trunk. The rot in the roots might have introduced a bacteria. Maybe some spraying with Draconil or Bayers 3 in 1. It is important for me to fessup that my experience comes from NON tree aloes. So I would get some people who grow tree aloes to add their experience. They are a bit different. There is a move afoot amonst the "SPLITTERS" to boot them out of the aloe family,get them listed as their own family.