The button polyps are good things. They can be very pretty, and fun to feed brine shrimp to. They get bigger and spread similar to a zoanthid. The sponges are also a good thing, and you'll see different types of sponges in all tanks.
The aptasia you want GONE, either by adding an aptasia eating peppermint shrimp or a copperband butterfly fish,(as stated by Moderator Repto!). The clear one you have is just a more mature aptasia. They tend to get more clear as they grow larger. They aren't a good thing so be sure to kill it with the rest of them.
There is another type called Mojano that looks similar to aptasia, but is darker in color and has more tentacles. People often confuse majano & aptasia as they are both anemones and look similar. You DON'T want mojano if they happen to appear. You can pull at them, dig at them or smash them, but all you'll be doing is spreading the little nasties further into your system. Kill these if you ever get them with the pickling lime solution Dakar is posting, as there aren't any fish or shrimp that like mojano (correct me if I'm wrong). Use an empty syringe with no needle, plunge up the mixture, and squirt it on top and in the hole they may be dwelling in. If you don't have a syringe, I suggest buying a medicine dosage syringe for children's liquid medication from your drugstore or grocer. It's worth it as you may have to use it again at some point, so consider it an investment into your reefing equipment! I also save my empty syringes from puppy/pet vaccines. Don't leave any part of them showing. This solution will wear away from the rock you put it on in time, or you can break it away from the rock after 3 days without harming your corals or your water. Don't put the solution directly on a coral though!! Both types generally hitchhike their way into your tank from something you bought or acquired from a tank other than your own. The darn things look kinda cute at first until you know what they are capable of doing to your reef. Have fun nuking the little pests!
....Angel :angel5: