The ice may be mealy bugs? It was not in good focus. Try to get a hand lens to take a better look. Some soft scale or mealy bugs can look like that. The tree does not look like it is frozen but it definitely is not healthy. I don't like to spray stressed trees. It is tedious but you can use a cotton swab dipped in alcohol and rub the "ice off" If it does not "melt" but is sticky and squishy it is probably one of the aforementioned pests. What is on top of the pot. I would remove it for now. Water the plant when the media feels dry. Take the pot to the sink or tub and water it thoroughly and let it drain. If you have a lot of chlorine in your water, put the water in a bucket the day before and dunk the plant until it stops bubbling. Make sure it drains well before you put it on a saucer. feed it with miracle grow 1/2 strength every time you water. Just add it to the water in the bucket (1/2 tablespoon). Fukien tea does need humidity so pebbles in the tray will help add humidity and keep any water in the tray from drowning the roots. It does like good light. Use a lamp overhead to add more light and a little bit of warmth. As soon as the weather permits, harden the tree off slowly to go outside for the warmer days.
Happy gardening in Hawaii. Gardens are where people grow.