I think if it was me I would basically start a new, especially if that tank has crashed. It could be much more difficult to bring it back to support the animals we keep. I would use dry sand like old castle and
aragonite sand that you would buy at the
LFS. I like to do a 50/50 mix with the sand. Then use new salt water to fill the tank. Once it is up and running grab about a cupful of sand from your other system you have at home to seed the sand bed and when you do a water change on that system add the water you pulled out to the 100 gallon tank. This should speed up the process of cycling the tank. As far as transferring the animals, go to the
LFS and ask if you can have some of the Styrofoam/cartons they receive the animals in. Usually they will be happy to give them away cause most of the time they just throw them out and what a great way to recycle. While your there also ask for some bags to bag the corals fish etc. this you may have to pay for but I find bagging the corals and fish for a move is the best way to do it. Get about triple of what you think you are going to need cause you should double bag, and some may rip etc. Also get some heat packs so you can tape them with duck tape to the inside cover. This will help maintain a steady temperature for the animals while in transport. So you double bag the animals ( one animal to each bag) then place them in the Styrofoam container, add heat packs taped to inside top of container, put the top on and seal it with the tape. Your good till you get home. I hope this is helpful in some way.
Take care
