Acan are probably the most desirable coral in this hobby,because of their color,growrate and behaviour..they love to eat in the night and change their look ..kinda looks inside out..but they do not take a lot of space..they like to be in the sand or rock..and get nice and puffyvwhen happy..not a hard coral to keep..belongs to the lps,like candy cane,brains,chalices..have a hard sceleton and meeaty puffy flesh..look atMytemouses acanthread...to see all the different colors..mine is ultra grade ultra color ausdie..the best you can buy..in the store you would easy pay 30 a polyp..i cannot believe it is not bought up yet..really good deal