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Chrismo,
Living things either use light energy to produce complex molecules (producers like plants and certain bacterial and microorganism) or metabolize complex molecules for energy (consumer like fungi, and the rest of the animals)
These manila clams are filter feeder. They eat and produce waste, most of which is nitrates. Tridacna (due to their symbiotic relationship with the zooanthlle) are net producer. Without the zooanthelle, Tridacna clams are consumer also.
BTW, all the link you provided are about Tridacna clams, these steamer clams are not.
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