Freshwater Clam Food & Water Conditions
Freshwater Clams are filter feeders subsisting on a diet of tiny bits of floating edible matter in the water column. The source of this “floating food” can be naturally occurring and from supplements.
Freshwater Clams like tanks that are not “too clean”. Aquarium water needs to have plenty of very tiny debris, detritus and decaying matter floating in it. This does not mean that the tank cannot be “aesthetically clean”, it simply means that aquarium water needs to contain sufficient levels of edible matter for the clam to eat. To this end, keeping Freshwater Clams in moderately or heavily planted tanks is a good idea. Live aquarium plants continuously shed edible plant matter into the water column.
In most cases, feeding a Freshwater Clam naturally occurring edible material is not enough. It may be necessary to supplement a clam’s diet with very finely ground Calcium enriched pellets or tablets, fish flakes or algae wafers. As these supplements dissolve, a Freshwater Clam will begin filter feeding them out. Keep in mind it’s important to avoid overfeeding as access organic matter in aquarium water will lead to water quality issues. Use common sense and test tank water for ammonia levels often.
Another important Freshwater Clam care issue relates to aquarium size and the amount of water it holds. There needs to be enough water in the tank to hold sufficient edible matter to support the clam’s nutritional needs. Some suggest one Freshwater Clam can be kept in small tanks like a 10 gallon aquarium. Small tanks may suffice, but in general, the bigger the tank the better. A 29 gallon aquarium may be a safer choice for one clam.
https://www.aquariumcarebasics.com/freshwater-clams/