I have a 50 gallon fish tank and have an undulate triggerfish and was looking for interesting tank mates to be out because the undulate triggerfish hides sometimes. I was wondering if an engineer goby could with the Undulate triggerfish. I am wondering if the Engineer goby would make the wall of live rock collapse by bovine the gravel and possibly cause a rock to hot the triggerfish. I am also wondering if the engineer goby would be eaten by the triggerfish. Any advice would be appreciated. Thanks!