Adding more fish

[fixedpoint]

I have been running my 30g reef tank for a little over a year now with a clown fish, a chromis, and a helfrichi firefish. I have a number of invertebrates: 2 cleaner shrimp, 5 sexy shrimp, 3 hermit crabs, a porcelain crab, a conch, 2 pom pom crabs, and a variety of snails. I also have some LPS corals and zooanthids. Things are going well and everyone is happy, healthy, and getting along. Recently, I have been considering adding some more fish and I would love some advice. Here is what I'm thinking:

1 fish swimming in the water column: mccosker's fairy wrasse, yellow assessor, coral beauty or royal gramma
1 bottom dwelling fish: shrimp and goby pair or lawnmower blenny or mandarin dragonette (seeded copepods in fuge and tank a year ago added boosters every 3 months, have materials to culture phytoplankton + copepods)

A few things: I love active fish, sand bed is only 1 inch currently, I have a 20g sump + fuge, I kind of would like a herbivore, my three fish now stay in the water column

Any concerns? Experiences? Which are most fun to keep? Thoughts? Other options I should consider?

 

[jraker]

a royal gramma would be good for the water column. mine was great until it got ich.

you could go with a goby without a shrimp, because pistol shrimp can move around the sand alot and could harm other inverts. i have a randalls goby in my 36 and he is great

 

[Deinonych]

With that size tank, you are limited in your options to add more. IMO, you can probably add one more, but that's it. The wrasse and angelfish are out, as they require more swimming space. Any of the other fish listed will be fine as a single addition, with the exception of the mandarin (difficult to care for, even with pod cultures).