Not necessarily... they tend to start to feed faster initially than Tubastrea, however I believe that's due to poor handling methods and longer "transfer" times on Tubastrea compared to Dendrophyllia.
Feed them frequently, and either of them are easy... the trick is keeping your nutrient levels down once your feeding heavily. Once you have them opening for food, all that needs be done is feed 'em.
Here is my general little blurb post regarding Tubastrea vs. Dendrophyllia:
"Any coral such as Tubastrea and Dendrophyllia open at night in nature due to the high density of plankton in the water column to feed off of. They're non-photosynthetic... light doesn't bother them, but in nature they feed at night, which is why they're commonly closed during the day. "Training" any of these corals to stay open all the time is easily do-able... Another note to mention is that Tubastrea and Dendrophyllia are found in very shallow waters along side photosynthetic coral. They're not as common at these depths as they're outcompeted by their faster growing photosynthetic counterparts, making living in the depths, where their counterparts cannot survive, an easier means of survival.
IME many Dendrophyllia sp. open more readily initially than most Tubastrea, which IMO is due to handling and transportaion practices. How often do you see a damaged or sickley looking Tubsatrea? Pretty much every time you step into any LFS... where as not the same can be said for Dendrophyllia.
Regardless these corals need to be fed, and fed a lot. I feed mine daily, but generally every other day is sufficient. The amount of time they're open depends on water quality, foods offered, and frequency of feeding... FWIW, my Tubastrea and Dendrophyllia sp. are open over 90% of the time."
