Let’s see!this should be MULTIPLE CHOICE question, but since not, I picked other. Used:
- acrylic rods
- reef mortar
We marked out the space we had to build, created plan to build sleeping caves as well as terraced coral spacing for maximum lighting options, then arranged, drilled, pegged, and to ensure solid yet removable structure, reef mortar (with temporary plastic barrier while reef mortar dried so rocks can be pulled apart yet fit snug)