i had two mated clowns a yellow watchmen goby an emerald crab and a LTA,BTA, and a coral beauty everything was fine until i introduced the LTA my goby vanished into thin air and then 4 days later the smaller of my clowns also disappeared. i noticed that each time a fish disappeared the LTA was excreting waste. i have a 50 gallon tank ...is it possibal that the LTA ate them or was it the emerald crab?