The round colonies of Astreopora are probably one of these.
Astreopora gracilis
Characters: Colonies are hemispherical. Corallites are immersed to conical or tubular, usually face different directions and are of mixed sizes, giving a chaotic appearance. The coenosteum is covered with papillae that are inclined on the surface. Colour: Pale cream, green or brown. Similar species: Astreopora myriophthalma, which has an orderly arrangement of corallites. Habitat: A wide range of environments, especially in shallow turbid water. Abundance: Sometimes common.
Astreopora myriophthalma
Characters: Colonies are hemispherical, with an even surface. Corallites are evenly spaced and conical with rounded, upright or outwardly directed openings. The coenosteum has outwardly directed papillae. Colour: Cream, brownish blue or yellow, sometimes mottled. Similar species: Astreopora listeri, which is distinguished by its smooth coenosteum and immersed corallites. See also A. gracilis. Habitat: Most reef habitats except very turbid water. Abundance: By far the most common Astreopora.
And I thought my plating piece was this
Astreopora expansa
Characters: Colonies are flat bifacial plates arranged in tiers or whorls. Corallites are mostly inclined on the colony surface. Coenosteum papillae are fine. Colour: Brown, pink or dark green, usually with pale margins. Similar species: Astreopora myriophthalma on lower reef slopes may become laminar but A. expansa is usually distinctive. Habitat: Shallow reef environments. Abundance: Usually uncommon but conspicuous.