We just bought this purple long tentacle anemone last week. We are not quite sure if anything is going wrong as to the fact that we are new to corals and trying to understand them. Anywho, the tentacles seem to be getting thinner and a tad brown at the tips, white at the base, and isn't flourishing as much as it had been. Photo shown below...
Also, do these anemones tend to turn the sand (which is white with black pebbles) around it to turn brown?
Also, do these anemones tend to turn the sand (which is white with black pebbles) around it to turn brown?

