How do you feel about pot size? I wouldn’t want to go too big, would I?
I’m extremely terrible about judging size from photos. If the pot had room for the roots, plus just a little more for growing room, it’s the right size. You are totally right that you don’t want to use a pot that’s too big. Using pots that are too large is a good way to rot roots.
Muddy is correct on this. And, as far as your plant reviving, don’t count your chickens, yet. What your little Meyer is doing, is blooming. This can actually be a signal of imminent demise, as it is a citrus tree’s last ditch effort to survive by producing progeny. So, you can get excited when you see new leaves pushing out 
Be sure to remove all the fruits that set for now (whatever hasn’t dropped on its own). Your tree needs to focus its entire efforts into canopy recovery, and not fruit production.
Patty S.
Is a certain level of indoor humidity during the winter months required?
According to many, it is not. They grow well in desert and dry Mediterranean areas, after all.
I may be wrong about this part, but I’m under the impression that spider mites, which can suck the life out of indoor plants, thrive better with low humidity. Also, if citrus is water stressed, they are more subject to attack by mites and scale. Those have predators outdoors, but indoors their populations can explode. That’s where the regular treatments with neem oil and/or insecticidal soaps make a difference in how well citrus weathers the indoor environment.
How are yours doing now? Did you start feeding with the Foliage-Pro?
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What Muddy said No, citrus as a cultivar does not need nor require increased humidity. In fact, in the citrus states on the gulf coast/Florida, where humidity is much higher than western citrus states, citrus struggle with certain types of fungal infections due to the higher humidity that we never, ever see here in the drier western citrus states (Greasy Spot being one of those diseases). However - that being said, as Muddy mentioned, spider mites thrive in dry, dusty atmospheres, and both scale and spider mites will take advantage of a stressed plant. Citrus being grown indoors, even under the best of conditions will be stressed. It’s just not their natural environment. So, really, the best thing you can do for indoor citrus is to haul it into your shower and shower it off every now and then, and monitor closely for both spider mites and scale, which will inevitably find their way to your indoor citrus plants. Tree them appropriately as Muddy also mentioned. But, I wouldn’t worry about trying to provide increased humidity as it just isn’t necessary for citrus in their natural growing environment.
I appreciate the help you guys have given so far! I went ahead and bought a few more citrus now that I’ve got a better idea of what ideal indoor conditions should be. Valencia Orange, 2 Satsuma Mandarins, Calamondin Orange & Key Lime pictured. Gonna up-pot the 4 inch citrus to 1 gallons and will add a good slow release fertilizer to all of them. Still no leaves yet on the Meyer Lemon, but the rest are doing fantastic and are putting out new leaves. What night time temps should I wait for before I can put these guys outside?
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They’re still little guys. So, I’d wait until the nights were in the 40’s to slowly acclimate them to sunlight.
Be careful not to over water that leafless Meyer. I’m still going to recommend that you break down and get at least a small bottle of Foliage-Pro. It will last you a very long time, and can make the difference between whether your trees just survive or thrive. I prefer mine to thrive. 
To use it, just water your trees as you normally would. Wait to let the water drain and soak evenly through. Then water once again with the Foliage-Pro in the water. Use the dosage instructions for “Production” during spring and summer, but cut back to “Maintenance” in fall and winter. This liquid feeding makes necessary nutrients immediately available to your plants in a way that timed release fertilizers don’t. There aren’t many things that I recommend specific brands for, but using the Foliage-Pro makes so much difference that it’s worth emphasizing the benefits.
What varieties of satsumas did you wind up buying? I enjoy my Owari so much that I wound up adding more of them plus some other varieties of mandarins. Someday maybe I’ll have enough to satisfy my cravings for them through the fall and early winter.
Muddy,
I’ve got miracle grow for now. Once that runs out, I’ll definitely look into it!
I ended up getting both of mine from StarkBros. They’re the same variety, but I’m not what exactly what that is because they don’t specify.
As long as their getting their liquid feeding with micros, that will probably be fine for now. I’m not familiar with the NPK balance or micros included in the Miracle Grow. So, I don’t have an opinion on it. 
Whatever kind of tangerine it winds up being, I know you’ll enjoy eating it when the time comes.
That’s weird, Ross. I would contact Stark and ask what the cultivar is. That’s like selling a “plum” tree, but not specifying the cultivar. All mandarins are good, some are much better than others. Would be nice to know exactly what cultivar you have.
I would contact them, but like muddy says I’m sure I’ll enjoy it no matter what it is.
My Meyer Lemon is coming back strong with tons of new growth now. In fact, all my citrus is doing fantastic. Thanks for the help everyone!
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I’m glad to hear it’s on the rebound! May it produce many lemons for you over the years.