clowns do NOT need an anemone - most people keep them without them. I have had clowns for years without anemones because I didn't want to put an anemone in my reef where it could wonder around stinging things. Now I know there are people out there that will say diferent, but anemones belong in a dedicated tank. They are not compatable with corals!!! - alright I already hear people chimning in and saying "I have kept anemones with my corals for years without problems, bla bla bla" but this is MY opinion and the opinion of many experienced reefers with years, not months of experience. Check out the WWM site for further info and I guarentee they will agree with me. If it is your goal to have anemones with your clowns - dedicate a tank to that goal. You need reasonable light, current, and aquascaping that matches that goal. I currently have done the same thing with one of my tanks. I have a 20 gal with about 20lbs rock, a pair of clowns, a blood shrimp, and a captive breed RBTA - do not buy a wild caught carpet. I may not add anything else to that tank, but if I do I will research compatability before I do. Oh yea 130W PC lighting which is boarder line, but I have aquascaped to give the anemone a choice of height in the aquarium.
Now as far as ammonia yes any is too much! but also the second part of that same cycle - nitrite - any is also too much. This is why all the people who responded to your first post said to wait at least a month before adding animals. The bacteria in a new tank need to build up to handle the biolode and that takes time.
What else have you bought aleady?????