How about a pic of your tank? We may be able to determine the light that way...
On to the bubble coral they are LPS coral and fairly easy to care for. I just bought one about 2 weeks ago (you can click link next to my name and see it) and it is a very easy coral to care for. Requires moderate lighting and minimal flow or at least mine likes that. It grows HUGE during the day and at night it pulls all the bubble in and you only see a skeleton of the coral (very cool). I direct feed it mysis shrimp and it's very content.
My lighting is a T5HO.
Other LPS corals that are very easy to care for are:
Frog spawn
Hammers
Candy Canes
Other corals in gereral that grow well and are easy are:
Zoo's
star polyp
cloves
xenia
mushrooms
leathers
palyps
etc..... I own all these corals and they do very well under my lights...