What's your question? Ask

liquid feeds are good for a quick fix , also transplanting to a slightly larger pot and adding in some fresh soil and testing for proper Ph.

They can produce a flower bud in 1-2 years, but you may want to let them get taller and more mature before allowing them to produce fruit. This will make for a stronger plant in the long run.

I believe this article will answer your questions, just pay attention to the variety you chose to grow, as some are better adapted to being grown in this way.

https://www.gardeningknowhow.com/edible/fruits/banana/indoor-banana-plant.htm

You don't have to remove them unless you want to propagate some new plants. It will not hurt to leave them or remove the pups. If you would like to start new plants, simply cut the pups from the mother plant and pot them up. You can also toss them or give the pups away if you don't want another plant.

This can be caused by underwatering, overwatering or a fungus. Water the plant when the top of the soil is just dry to the touch, but make sure it is not in standing water.

As a precaution, treat the tree with a fungicide.

Bananas will ripen off the tree. You can keep them there until the lest possible moment before the cold sets in and then pick them and place them in a paper bag. They should ripen in there.