My tank is about 8 years old and over time has grown into a reeflike structure as colonies have died with new colonies growing on top.tank is now full and I'm thinking of a reset,a long time ago I broke down a cube and the detritus that was kicked up killed my few fish in the tank.looking to avoid the pitfalls and get advice from people that have done it.i have a 30 gal frag tank connected to the DT so I have a place to temporarily house the colonies I'd like to keep and sell the ones I dont.all information appreciated