80 degrees F
this coral appears to be made up of six individual polyps. i've had it for about two months. it's taken on a beautiful healthy color since then and appeared to be doing really well. recently, the polyp on the very left hasn't been opening (as you can see). any idea why? i use tapwater, which is quite high quality, but my R/O unit should be arriving soon. help save my coral, please! i love it.