Yes, you can glue them down with Super Glue or Super Glue Gel (works best). Just take the coral out of the water, pat try a little area and apply a small drop of glue, then put in the tank and attach where you want, it will dry quickly. Make sure not to get any glue on the crown of the polyps though!
As for the Colt Coral, they are photosynthetic so good water qualiity, low/medium current and good lighting will keep them strong and healthy. They may benifit from additives in the water designed for corals and filter feeders as well.
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