2" in diameter, WYSIWYG and fully aquacultured by WWC! Unfortunately, Goniopora still get a bad rap. Gone should be the thought of them possibly not doing well for the intermediate or advanced reefer. We have over 40 varieties growing out in our farm and if we can do it, so can you! Goniopora prefer lower to medium-low par (125 to 175), with medium alternating flow and to be target fed an SPS food (due to their smaller mouths at the end of each tentacle) several times weekly. Just don't over do it. A couple of squirts is all it takes.Lighting = Low Light at around 125 to 175 parFlow = Low to Medium Alternating FlowFeeding = Good Quality Frozen LPS Food 1x / weekly