Engineer goby missing!

[SleepyPirate]

So I bought a small Engineer goby last night to wake up to it completly gone, I turned off my power heads last night just in case cause it was so small and wake up this morning and its disapeared, I moved the rock looking for it but no sign of it. I had a small blue tang disapear aswell a month ago what on earth is eating it?

My tank has 2 clown fish and a yellow tang for fish.

Could it possibly be my GBTA?