Today i lucked up and bought a pair of Diamond Watchmen Gobies for 20$. They were supposed to be more but the lady mistacked them for engineer gobies. I don't know a lot about these fish. After i put them in the tank one of them managed to wind up in the overflow box? I haven't seen them jump any more but one of them continues to hang out around the surface of the tank which worries me. I think it might be a little scared of the flame angel. I don't have a sand bed instead the bottom of my tank is covered in purple coraline. Will this be a problem for them to eat? And should i worry about him jumping out?