Hello yourself
Many folks worry about carbon removing trace elements in the water, I don't worry so much about it.
Take a look at what else removes those trace elements.
Protien skimmers, ozone, and the metabolism of all the corals and fish in the system.
I personally think its a myth that carbon just strips the water clean of these trace elements, sure it may take some, but the benifits of using it for 12-24 hours out weights the negitive.
This is a great part of why folks do water changes, to replace those trace elements that the system uses and to remove those built up toxins, nitrates, phosphates etc...
As long as your system has been established and the cycle is over ammonia should be no worry. The bacteria breaks it down rather quickly into nitrites then to the least toxic nitrates.
As long as you have good feeding and maintanence habits you should have 0 for ammonia. Yes its always being produced by fish waist, but depending on filtration and your habits its not as great of concern as to have something that removes it constantly by ammo chips or something.
You could run a bag of ammo chips or rocks if you like or even a polyfilter (a great product) for that purpose. But it does not need to be run all the time. Only if you wind up with an ammonia spike.
Thomas