Two of the prettiest, easiest and most popular cave handing species in the aquarium trade are Tubastrea (of course) and Nephthyigorgia (Red Chili coral)
Both are incredibly hardy and long lived in aquaria and will reproduce simply with good water quality and regular (near daily) feedings.
And both almost always die in aquaria in a matter of months (less than 2 years) because aquarists typically get busy or lazy and (worse) put these corals in crowded garden reef aquaria that is nutrient scrubbed (aggressive skimming, weak feeding, etc).
Its a simple matter of hedging your bets and meeting basic needs for these hardy but hungry corals.
For Tubastrea, you can simply drill the skeleton and fish plastic cable ties through it to lash it upside down. For the Red Chili coral... it's a softy, stitch it with clean fishing line and enjoy. The latter needs fine zooplankton (baby brine shrimp and/or rots, copepods, etc)... the former can eat slighlyt larger food (as big as thawed frozen mysids).
Neither eat much or any phytoplankton.