I know this is an old thread, but I found it so people are still probably reading it. Just a few things I can add to the new readers.
Don't put pistol shrimp in with narcissus snails, pistol shrimp tend to close off many of there "homes" every night and don't really care with what...a live crab (they can just pull themself out), or a live narcissus snail (which other things in the tank will find tasty and get buried by the shrimp as a support beam). Anomia, nitrate bombs. Love pistol shrimp but you have to know there habits.
Blue, purple, UV lights are great for coral color but are also a migraine trigger for some of the population, yep, I'm one of them so I run around 10K range and while it doesn't do much to the color of the fish many of the WOW colors I bring home on coral just turn brown. Others keep that POP and a small few even get better.
Aiptasia is best handled with Lysmata species (Peppermint captive breed is the most likely to eat them, although Red Stripped Shrimp a few others will also), the further you get away from the captive breed the more likely they are "reef cautious". I just last week added a JF John Deere Leptastrea and as usual the Peppermint shrimp came over to check out the new addition. About 4 hours later I noticed he was still there and I went to check things out, she had eaten the entire mat by then...nothing but skeleton left.
As for Asterina Starfish if you catch them in 1-3 days manual removal is your best option, day 4+ and well now you might need some help. Pico tank = 1 bumble bee shrimp, no problem, just make sure he has a 1/2" snail to catch a ride on up to the higher spots in the tank. Really funny. Nano tank well now you are in the 1 shrimp per 1.5 gallon zone, less shrimp if you have a light breakout or are patient. Bumble bee shrimp will eat whatever but seem to prefer starfish if you have any. So once you run out of starfish I'd find them a new home or be willing to lose some softies.
I'm about to get some Xenia for the "lights on" part of my cycle, I've had fish in there for long enough and Xenia is a great first coral. Just put a rock out of the way and let it grow, trim as needed until your cycled up to the harder corals. Once you don't need it take the entire Xenia rock to your LFS or someone else cycling a tank.