I have a 140gallon. 7ft. long. In it currenttly is one Panther Grouper and a Neon Velvet Damsel (the damsel is five inches. The grouper is about the same. I have a Snowflake eel on hold at the LFS that is 12 inches long waiting for me to get my top sealled off and a Green bird wrasse I pick up next week. There is also a Moly in this tank but he hides a lot and won't allow me to catch him so I can move him to a safer tank. So unfortunantely he may become lunch one day. This also has an Orange knobby starfish, a chocolate chip star, and a purple lobster. various snails (over 100) as well
I also have a fifty five gallon tank that houses two seahorse and an engineer goby. 5 hermit crabs, and 25 snails of various kinds.
I have a ten gallon I am setting up for a Mantis shrimp and I am looking at a 33 gallon tank in the local paper currenttly.
I have a 4-6 inch live sand/crushed coral bed in the 140 with about 35 lbs of live rock.
I have a 2-3 inch live sand bed in the 55 with 25 lbs. of live rock.
Are you using crushed coral if you aren't using sand? If you have a bare bottom tank I suggest getting a 40lb bag or argonite live sand for your 55. This will help with filtration.