I was surprised too.After hearing your response I figured i'd do a search and see what i could find.From what i've read previously,wild Porites doesn't do well.In that study,P.lobata seems to be abundant up near the reef crest.That biotope is tough to recreate.You got waves crashing,shallow water,there are upwellings of planktonic foods.In another study i read,the worms feed on phytoplankton so daily phyto feedings might help.