So I just re-scaped my aquascape and noticed a lot of animals, there was even a giant brittle star that I didn't know it was still alive, it grew so much but I noticed this algae like thing but I'm not sure it's algae, it's pretty stringy and sand sticks to it
(not the aiptasia) I saw someone saying it's from a snail I forgot the name, that lives in these small pipes stick to rocks, probably true because I saw the same thing in a small hole and it disappeared