so if there was a tank that only had coral, no inverts or fish...wouldnt the water be spotless? and for longer? as in the parameters... because there wouldnt be anything producing ammonia and waste so nitrates would develop much slower. or would there not be enough waste to keep the beneficial bacteria alive...? would you therefor at least need an invert or smal fish... or can the live rock sustain itself and the water volume... anyone had experience in strictly coral tanks?