i am breaking down my 125 and setting up a 55g frag tank. if I use mostly water from the 125 to fill the 55 will the tank go through a cycle? there will be no fish in this system. only corals. and not many corals to start. just a monti cap, a couple acros, some rics, one acan colony, and a maybe 10 zoa frags. i will be transfering some LR over to the 55 also. there will be about 100g total in the new system (55g frag tank and a 55g sump/fuge) so what would you say a good ratio is for old tank water to new saltwater. like 60g old/40g new? has anyone set up a tank this way before?