To give a little history, if I may...
She had a mantis. The LFS recommended soaking it's home (a large LR) in very high salinity water, which they mixed up for her. It seems to have taken care of it. (now bob, don't cry TOO much over this). Anyway, the rock is now back in the tank. Could it have caused a mini cycle? Or could the rock have had enough salt collected in it to cause a small, but instant jump in salinity?
I'm afraid I'm not much help because I'm not familiar with sand sifter starfish to this level. I have three of them in my 120 and so far so good. They are getting very fat though! Which tells me I'm feeding too much.
