I started the tank abought 2 years ago.got abought 100 lbs of lr.rock is covered with sponges,feather dusters,and shrooms.I have a 3 inch sand bed.livestock is as follows-2 blue devals,2-sargent majors,1-clown,1-lawnmower bleeny,2-sally crabs,1-banded coral shrimp,1-brittle star,and...