well, where do i begin... hmmmm ... well, im thinking your tank is way to new to have that type of livestock... way too many fish and way too many corals... and yes, I know many people stock tanks like yours with way more stuff then what you got goin on...
but, your ammonia level is definately indicating your biolgocial orginisms are still growing and evolving...
And ultimately until that is steady and mature things are just going to happen... some minor, some maybe not so much
As for yuour ich issues, i would start off by making sure you feed the fish well, that does not mean feed a lot, it means feed healthy foods... if you have nori/seaweed for the the fish that eat it, then use that whenever possible.
a good variety of food is also good...
other then that, maybe a uv filter to help minimize the ich population to minimize the qty of prasites that could attack your fish...
there are other discussions about quarintining the fish prior to placing them into the display tank, but realistically, that usually ends up poorly or not working... if you have a public aquarium or have multiple tanks and and all that, then yes, by all means, setup a good hospital tank and quarnite tank system...
byt for casul hobbyist that has one display tank, it isnt reaally practical to setup three tanks minimu to suppoprt the display tank...
For now, i would feed the fish better/healthier.. I would also try to address the ammonia issue, and do some good sized water changes.. and maybe a ammonia treatment something or other...
maybe look on craigslist or ebay for a uv filter....
If you do get a uv filter, make sure you tear it apart prior to installing it to see how hard/easy it will be to clean it after you install it...
then make sure you clean it every six months.... or it will become opaque with calcification outside the quartz sleeve...
