I have some of those things in the first 3 pictures. Ive seen em for 3 weeks they dont get bigger and dont seem to be spreading so Im not worried about them. I would go with yote on that one. But then again im new to this game so theres my 2 cents.
I definitely can see the skeleton of a cup coral in the third pic.The first two,I cannot see a skeleton but many more tentacles than aiptasia[and the way the tentacles are folded not sticking upwards].Definitely not majano,probably not aiptasia,likely cup coral.