HELLO EVERY ONE I NEED TO KNOW SOME ANSEWERS I HAVE A 75 G TANK IS THAT BIGG ENOUGH I HAVE A SUMP IS THAT GOOD ENOUGH CAN U KEEP ANYTHING W THEM AND I WANTED TO KNOW WHAT IS THE SMALLEST SPECIES I COULD GET AND THE LEAST AGRESIVE IF ANY AND ANY OTHER KNOLAGE I COULD GET FROM SOMEBODY WOULD BE APRIECATED PLEASE SOME RESPOND THANK U