I PURCHASED A USED 75G ABOUT 2 MONTHS AGO FROM A PERSON WHO GOT INTO SOME MONEY PROBLEMS AND GOT A GREAT DEAL. HAD A LIONFISH, NIGER TRIGGER, AND A LARGE GROUPER, SEA URCHIN , BRITLE STAR AND A CORAL BANDED SHRIMP. I TOOK ALL THE FISH OUT AND SOLD THEM. GOT MY NITRATES DOWN BEFORE I ADDED 2 PERCULAS CLOWNS THIS WEEKEND. MY QUESTION IS ARE THEY GOING TO BE SAFE WITH THE 3 CRITTERS LEFT IN THERE. THE SHRIMP TAKE A PINCH AT THEM IF THEY GET NEAR. JUST CHECKING TO BE SURE, WANT TO ADD ABOUT 3 OTHERS AND THAT IS IT. TANK WAS ESTABLISHED FOR 4 YEARS. THANKS