Thanks Kristin.
Thanks Beth, it has been running about 3 months now. Yes one damsels stresses the other damsel by chasing him around. The hang on the back canister shoot the clean water down toward the back of the tank and the dual power head on the left side also shoots the water downward across the tank, thats why you noticed all the sand towards the front of the tank is blown away. I like the movement of the crabs and they do a good job in cleaning up any left over food or corps I wouldn't be able to see or reach with those Coral inserts ect..Thanks for the constructive comments. Not bad for a newbie, huh