@thephoreefer did a DIY version of these rings:
DIY Coral Frag holder for rocks
Reason to do this. Hate having to pull out my torches glued on rock every time I want to inspect the health of my torches. Also waste glue by reglue back on rocks. Sometimes i would damage the coral by taking it out. With this I can take out and inspect with ease. Also able to take pictures and...
www.bareefers.org