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Define "bad." In reef aquariums where conditions are hardly the same as in the ocean (excess nutrients, different lighting, confined space, limited diversity etc.) sea pearls, aka Ventricaria ventricosa, can dominate the desired sessile invertebrates in the tank. They can gain the competitive advantage over coral in the wild in conditions lacking appropriate grazers or if the region experiences an influx of nutrients, triggering a phase shift. Usually, like Crown of Thorns starfish, the exist as a naturally occurring and even necessary member of the area's biota.
in healthy reef systems the sea pearl population is in balance with the indiginous marine flora - as in the previous post, without adequate populations of grazers like turtles, parrot fish, triggers, etc. they can start to over-flourish. One reason in the carribean, for example, we are very concerned with the Lionfish invasion as this species has very little predators here and a voracious appetite on juvenile native fishes. and they breed constantly.
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