Glockoma: to keep corals well you need the following:
1. 0 nitrate, nitrite, especially 0 ammonia
2. 7.9-8.3 ph
3. 8.3-9.3 alkalinity
4. 420 calcium
5. 80 temperature with very little variation
6. 1.025 salinity.
Salifert tests are good and accurate: you can rely on test strips for nitrate/ammonia, but you need full kits for alk and cal.
Corals hate change: do every correction very slowly.
They feed partially from the water, taking in chemicals and floating bits of food; they also feed from the zoaxanthellae [tiny plants] in their flesh, which photosynthesize from the lights, and help feed their host.
Shriveling often indicates low alk or low ph.
Provide them a good stable environment and they will multiply like crazy.
Re your anemone: tube anemones are difficult to keep. It will like enough flow to bring it food, and it will like a little stability. I'd bury its end and try to keep it down with some very, very light rock/coral rubble just to give it an anchor point. If you let it drift, it will end up in a powerhead if there's one in the tank. If you do have any powerheads, put the protective cone on, at very least, if not the sponge---and don't let that sponge go more than 7 days without a thorough rinse-out, or you'll get a nitrate buildup. A good habit is to rinse any protective sponges in the water you draw off for a water change: that couples the two jobs and makes sure those sponges stay clean.
HTH.