Based on the anecdotal evidence from aquaria, however, L. laevigata is generally thought to be primarily an opportunistic scavenger, perhaps being even saprophytic (preferring to consume dead items as they begin to decay), but as also been observed to apparently feed on algae and microbial films as a non-selective surface grazer. I say ‘apparently feed’ because to the best of my knowledge there has never been a single scientific study on the natural diet or nutritional requirements of these stars, and controlled feeding experiments are rarely done on animals in reef tanks at home. Therefore, all we really have are observations of what the animals seem to be sitting on and look like they might be eating - anecdotal reports of the diet and feeding preferences, but no real evidence that the animals really ingest and gain nutritional benefits from the stuff we think that they are eating in the aquarium. Having said that, however, this is the only information that we have currently on what these animals eat, so that’s what we must go with.