Very nice. This thread has got me daydreaming about my own frag tank. I have some questions. Why do you need a skimmer? Do the corals give off enough waste that a skimmer is necessary? I can't imagine that coral frags would suck up that much calcium. Would a 2-part system be enough? Why can't you add some cheato off to the side instead of modding the filter? Does anyone else have a frag tank they can share pics of?