I just found this article and it seems like what I have, mine are just smaller. Let me know what you guys think. I dont even think the Cichlids will be able to eat them and if somehow they manage once they grow up it wont really matter anyway because they were free. Let me know if you see any problems with this.
The Freshwater Clam is a living filter that helps keep aquarium water clear and clean. By removing uneaten food and detritus from the water column, the Freshwater Clam helps maintain water quality and lower nitrate levels. Like many freshwater bivalves, Corbicual sp. typically buries itself in the substrate. However, spotting its siphon protrude from the substrate is truly captivating to observe. This variety of the Corbiculidae family only reaches a length of about 2", which makes it a suitable addition to well-established aquariums of almost any size.
Though found in temperate freshwater rivers and lakes around the world, this species originates in Asia and has a brown shell, banded in black. For best care, house the Freshwater Clam in an aquarium of at least 10 gallons with medium to very fine substrate. The Freshwater Clam should not be housed with invertebrate-eating fish, such as freshwater puffers.
The Freshwater Clam obtains its nutrition from filtering food and detritus from the water column. If necessary, its diet can be supplemented with a quality invertebrate food. Keep in mind that the Freshwater Clam will not tolerate any copper-based medication. If treating the aquarium with medication containing copper, move the Freshwater Clam to another aquarium. Do not return the Freshwater Clam until the copper in the treated aquarium has been removed by means of chemical filtration.