they are very finicky, i had one that did great right off the back, but then hid for a week i turned the rock and it hid again, finally turned the rock again and did a large water change and now its been happy again only moved a couple inches out to spot with light flow, but now opening. i figured out why it got mad since i have a open top and my fuge area of my stand is also open i get alot of evap and i would wait too long to top off so the salinity swings where making it mad.