Welcome to Canreef. My anemone's deflate every once in a while. They do look really bad when they're deflated but if yours looks ok when it's inflated and is still eating it should be fine. Keep an eye on it though for any changes. What type of anemone is it? It sounds like you bought a complete set up from someone. Did you use the established water or mix up new stuff? The more info you give the better. Good luck
