Soon I will be cycling rocks and switching them out with the ones in my tank that has been running for 6 months. My sand bed is around an inch and a half deep. How do I go about removing the rocks and putting new ones in (and burying them as I have goby/pistol) without disturbing the sand bed? I am going to remove all cuc before so I don't accidently crush anyone. Should I remove all the fish too temporarily in case I disturb the sand bed too much while I try to bury the rock?