Looks great! Your clowns are pretty too.
All corals sting each other, and some will sting you (hammer and frogspawn get me). Mushrooms can unattach and reattach where they want. They also multiply. In general they don't sting others very much. Xenia is really pretty but will propogate all over the tank. Your candy cane is probably the biggest stinger, but has short tentacles to do so (1/2 inch). It likes to be fed a little food a couple of times a week. When the tenticals are out put a tiny piece of food in. Fun to watch.
Your clowns are about the same size. This might cause some fighting as they establish dominance. They should both be male at this point and the dominant one will get bigger and turn into a female. Then they will be a pair. If you see them bumping and pushing, or one shaking like its having a seizure, that's fine. If they start ripping fins or other damaging behavior you might have to separate them.
Looks like you might have some SPS too. Best thing for the tank is to do 10% water changes weekly. Being able to measure parameters is good too, but water changes will get you a long way.
Do you have a CUC? (clean up crew) Generally made of some snails and/or hermit crabs to help clean the algae. Hermits are fun if this is your first tank. Go with small ones like blue legged.
