#mokiarome

Pallanophblargh:  Alright, I'm going to pose some questions! It's good that you've made sure he's going to get more sun (can't go wrong there,) but make sure he isn't in super hot sun for hours right away! They can burn if they move suddenly from low to high light. I'm guessing it's dry, too: When i check my own plants, I insert my finger into the soil, and check the rigidity (turgidity) of the leaves. If they're limp, and the soil is dry more than an inch down, give a heavy watering until water comes out bottom.

Empty saucer so it's not standing in water. On misting: I personally feel it increases the chance of fungal diseases, so I don't do it. Whether this holds true in California, I'm not sure! Some put their pots in a dish with pebbles and water to increase humidity.I'm not sure what the spots are. I'm still uncertain about those spots, but they could be fungal. If it keeps getting larger but hasn't spread to other leaves, you might remove the leaf. Of course, be prepared for lots of white latexy sap if you do! 

The snake plant won't need misting either, I think it'll be fine with your climate, as long as he's getting water every 3 weeks or so (bone dry soil) and some light. 

About the pot color: Sometimes terracotta type pots stain dark, and they will get a moldy looking covering. Shouldn't be harmful, but aside from using a finger to check soil moisture, I use wooden stakes! Hope this helps, George doesn't appear to be in any immediate danger. (They're tough!)

So I instead of a windowsill I have a sliding glass door, and the plants are on a bookshelf about two and a half feet from the window. I was keeping the blinds mostly closed but have opened them more so they get more sun. (It gets really fucking hot in my apartment, so I have to keep it at least a little dark so Bindi the dog doesn’t expire.)

I did end up removing the leaf because the weird colors had spread and definitely looked fungal. I also watered them because the soil was dry like you said. His bigger leaves look a little better, but one of the smaller ones is still pretty curled. I’ll keep an eye on it.

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Mokiarome:  rubber plants are tropical species so they need water and humidity to not dry out. If the leaves are curling and youve had the AC on, my bet is lack of humidity. Spritzing wont help, you need to stick him in a windowsill where the humidity is higher, make a mini greenhouse using some clingwrap, or turn the AC down. An easy temporary fix is sticking it in the bathroom at shower time but it will need humidity all the time.

The white patches are where the chlorophyll has died. That cant be fixed, you just have to live with it now. Dying chlorophyll is due to lack of nutrients and poor sunlight. You have to remember that indoor plants still need time outside (under shade, they haven’t developed natural sunscreen living inside so can get burnt fast) as they dont get sufficient sunlight inside. To a plant, sunlight indoors even coming through a window is like twilight/nighttime.

Water permeable pots mean that root systems dry out faster. If the pot looks dry the roots and soil are definitely dry. If the pot looks wet but the soil is dry, then the roots are also dehydrated. Either way it needs a water. Rule of thumb is that if you stick your finger into the soil adpnd the first 2-3cm are dry, then water ensuring the pot has good drainage out the bottom.

I don’t have a windowsill unfortunately, so I’ll take him into the bathroom during showers and try out the clingwrap.

It isn’t too bad today so I put them out on my (shady) balcony in the late afternoon. I do have a question, though-- where I live summers are generally between 95 and 115F, with humidity at 30% or lower. I keep my apartment around 80F. Would the difference in temperature hurt them at all when I put them outside?

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Elektroyu:  Seconding the tips about watering (water when the top of the soil has gone dry; I've heard the soaking method works well for f. elastica) and what @pallanophblargh said about the bigger dead spots in the leaf. Apart from that I think misting may have been a good choice. If you keep it up for a few days you should be able to see if it improves George or if it's detrimental to his wellbeing. If all else fails you could still take him to the people you bought him from, they can inspect him in person and may be able to give you a more accurate assessment.

I’ll keep misting him for a bit and see if that helps, in addition to the bathroom thing. And taking him back to the store is a good idea. The guy I talked to in there seemed really knowledgable. He was the one who told me to mist the rubber tree.