About five years ago, I bought a fully grown and blooming Phalaenopsis orchid. After a month or so, the blooms fell off as expected. I continued to care for it as directed, but it never flowered again.
Instead, it produced four keiki, which I carefully transplanted into their own bowls with moss. None of them ever grew leaves larger than about 3.5 inches. Four of the keiki and the mother plant eventually died after about three years.
I have just one of the keiki left, and although it seems healthy, it has not grown much. It has three healthy, green leaves, none larger than 3.5 inches. I fertilize it about once a month, change its moss when the moss gets green, and keep it in a constant temperature with some sunlight throughout the day. I've starting watering it with ice cubes to see if that makes a difference, but it hasn't.
How can I get this last survivor to thrive? After five years, shouldn't it have at least grown to a full size?