Live Stock Strategy Question

tip: you can also search the forums - tons of threads on this question.

true. other reasons include - it's not necessary to add any live fish or dead shrimp to cycle... there is no reason to do it other than the fun of having a live fish while you cycle. Some folks are sympathetic to ammonia induced pain to a damsel's gills. They are one of the more difficult fish to remove. And, like Steve said, territorial issues down the road (if they survive the cycle).

 

I do not think a mandarin is a good tankmate for a sixline wrasse unless you have over 120g and lots of rock. They will compete for the copepods in the tank and a 55g is already very questionable IMO for keeping a mandarin healthy.
Also I would agree that your list is still a little on the potentially aggressive side and am not sure how your shrimp goby is going to do in a situation like that. If anything make sure it gets in there first and gets well established before adding other tankmates.
Potential aggression can make for a lot of headaches so be ready with a fish trap and it might be worth getting an in-tank acclimation chamber or breeders net so you can separate fish if they start going after each other.

Also, discosoma mushrooms can spread like crazy when they really get going and can be hard to get rid of. They actually will detach and float around the tank and settle down somewhere else and start reproducing there so you never know where you might have new mushrooms sprouting up. For this reason I don't like them because they are sort of like anemones in that respect, they can settle down next to your prized (or already sick/unhealthy) coral and start stinging it. Something to beware of.