I have had a bubble tip now for about three months. When I bought it, the tentacles were stubbier and fatter and it immediately found a crevice and hasn't moved since. However, now most of the time it spreads out more like a long-tip where you can see the mouth and the tentacles are longer and thinner. Every once in a while the tentacles shrivel up really small for a few hours then it returns to its open size. Wondered if I am feeding it enough. The 20g tank gets 25 drops of liquid food 3x a week for a few zoo's in the tank and this anemone, plus once a week I feed the anemone a few small chunks of thawed squid or brine shrimp. Yesterday I bought a tomato clown and within 2 hours it took to the anemone.