Elena, I hope the extra info helps! Bobby...I just don't know about you! lol
Elena.... the pictures I posted and labeled for you are exactly as I named them. An aiptasia has a whole different look to them. They do look like an anemone, kind of see through, and are indeed a member of the anemone family. The picture's that Bobby posted of aiptasia are quite dark, but that may be due to his camera. They appear to be more of a fleshy pink color that attack to corals, rock, tank glass, and unfortunately for one of my seahorses they can attach to just about anything. My seahorse had a bad bite where it attached to her tail, and she was sick for 2-3 days. You don't want those in your tank!! I can get a good picture of one for you if you'd like. They pack on heck of a sting and will kill coral if it is left to multiply and burrow into the surface of a coral. PLEASE take a picture of what you are questioning if none of us are hitting the mark. If it doesn't look like either picture I posted for you, then it is something else. As far as the scientific name for the Q-tip or Pineapple Sponge, I can't find it anywhere. It's such a common sponge that not many people ask for that information. I searched the net for probably a half hour (committed Site Owner aren't I?) :bsod:, and there are books that can be purchased about "All Sponges" that will answer that question for you. Sorry I can't help you on that, but if I ever find out I promise that I will let you know! :o Let the sponges continue to grow in your tank. They don't hurt anything and they are a great nutrient reducers for your tank. They are pure filter feeders, and are a good sign that you've got a healthy tank started there! Congratulations!
<Quote Elena> The second set of pictures though, I am confused. I had those in my tank, they were referred to as a type of anemone, on some pest page. <End Quote>
The mini feather duster is not the best picture I could get and I apologize for that, but it is indeed one. The white tube is hard like a shell. Some stand up straight, but this one decided to lay down on the rock...hard to photograph clearly. These are not harmful in any way at all, and actually as more appear for you, you'll grow attached to them as they do come in different colors and such.
Bobby.... good gosh, if you have that many aiptasia to photograph, you have some serious work to do in that tank! Start scrubbing your rocks in fresh saltwater with a toothbrush, rinse and repeat. Leave them in some saltwater to see if they appear again. You don't want scrub them off within the tank, or the live rock to die by using any other water than fresh salt water. I have 3 rocks that need to have the same process done just because I got one frag sent to me with on stupid aiptasia attached, so I kinda know how you feel, but the tank if virtually empty...thank goodness! You will never get them under control at the rate they are growing in that photo! Wow! Good Luck!