I have 3 pajama cardnails that only hang out at the back of my tank, behind my rock. So it was suggested to me I should move my rock farther back so there isn't as much room to hang out back there. I am worried to move my rock because my goby has his main home under the rocks I want to move. I am afraid if I lift off some of the rock it will shift the others enough to then squish my goby. Should I worry about this or should I just go slow? My goby is a diamond goby so he tries to stay hidden if anything scares him so I don't think he would come out easily!