Aquascaping the 400 gallon reef tank

Tried to show how I made the dead coral tree structure in my 400 gallon. Used nyos cement for the first part but I went through four bottles on just half of the tree. Used some Portland cement, sand and an acrylic concrete binder for the rest of it.
Came out pretty decent, but it takes a while. Each joint I let cure for close to 24 hours as a couple time moving it before it would break apart. That was with the nyos as well as the home made mix. So I would get a few additions and joints a day and then come back and add on. Took me four days for the tree and about three days for the arch and island.
Things used
Nyos cement
Caribsea Fiji pink sand
Caribsea Belize branch
Caribsea 36” arch
Marcos rock saver pieces
Amerimix Portland cement
Sika pro concrete bonding adhesive and acrylic fortifier
Super glue
Hammer and chisel