what would eat a GBTA, 6line wrasee, yellow clown goby?

[Milad]

So first my yellow clown goby went MIA without a trace
Then one of my 6 line wrasses went MIA without a trace
now my GBTA went MIA without a trace. the GBTA went MIA with a 4inch mean maroon clown hosting it. so weird, i havent seen anything in the tank.
All of them are around where a porcelain shirmp hangs out but he doesnt seem mean.

im so confused! And so is my maroon clown, shes hanging out where the GBTA was.