I won't do that to you, but honestly water from the mill would have been better. fish only or not, the algae growth from tap water will be a pita, unless you get a major cleanup crew. (by the way the crushed coral will end up on top and the sand on the bottom, then you may or may not hate the crushed coral. I use itin my 75. about to yank it out so i can get fish that burrow in the sand. so if you need more i got it. Fyi, if you start to get hair algae, a 2 spot bristle tooth tang will be your friend, that and high mag levels, (1600 to be exact)
for bubble algae, the small ones, emerald crabs and a naso tang will be your friend. get a few turbo snails for the glass, the mexican ones. the are monsters at cleaning. if you want to keep the substrate stirred, an engineer goby will do the job, just make sure your rocks are on the bottom of the glass and not on top of the substrate, otherwise rockslide.
what kind of fish you plan on keeping?
