i purchased an acan last week and it's doing great, it has two heads and since i've added it to my tank i can see that there are three new ones that have started to grow and one of them i can now see a bit of when the other two are fully expanded. i'm pretty excited about it cuz these three are only on the side i can see who knows what is going on on the other side. but my question is that it always has it's tentacles out. is this cuz it is hungry or is this just normal? i fed them yesterday and this morning it's tentacles were out again. i feed it twice a week and as i said it's doing great and growing before my eyes.