It is going to depend a whole lot on the lighting and the size of the tank. Hammer, frogspawn, and torch corals are cool but they need a good bit of room around them as a buffer. Some all-in-one nano tanks will let you keep montis and birdsnest and such, while others will not based on the type of lighting.
As anyone can see from my pictures, I have become a colorful montipora fanatic, and would love to fill a tank with the various encrusting species. Which reminds me, I won 6 more of the Reef Empire auctions over the weekend and need to post pictures of my newest corals soon.
