Hi, welcome to ReefBase.
If you've only just got it, it'll still be settling in. It's normal for anemones to have their mouths gaping when they're stressed by conditions or change. It's never a good thing, but pretty normal at this stage. The white filaments are messentrial tissue, part of the anemone's digestive system.
Keep an eye on it and don't interfere with it and it should tighten its mouth over the next day or so.
Bubble tip anemones are one the the hardiest, so it's a good anemone to start with.
How long has the tank been running? It's looking healthy generally.