Instructions
Determine the exact needs of the clam species that you wish to keep by researching them online or asking a supplier. Different species require different conditions and tank mates, and may require some adjustment to the following steps. For example, stationary clams should be kept away from stinging anemones.
Use T5 or metal halide lights to illuminate the aquarium. Place several sheets of fine-mesh window screen between the light source and the upper tank glass before turning the lights on for the first time, because sudden exposure to bright lights can kill clams. Remove one sheet of screen each week until the light is fully exposed. Replace the screens and go through this process again whenever adding any new fish or invertebrates to the tank.
Use a water testing kit to determine the tank's pH. Most clams require a pH of about 8.0 to thrive. Increase the pH if necessary with chemicals or by including limestone rocks in the tank (which will also increase calcium levels). Test the pH weekly and adjust it if necessary.
Maintain high levels of dissolved calcium by using chemicals, adding limestone rocks or suspending nylon stockings containing crushed shell grit in the tank.
Avoid the use of medications as much as possible. Compounds containing copper are especially hazardous to clams. Remove the clams (if possible, as some clams firmly anchor themselves to surfaces -- do not forcibly remove an anchored clam) before any major water treatment.
Provide feedings of phytoplankton (the exact amounts will depend on the species and number of clams in the tank) to supplement their diet.
Change the water regularly to maintain water quality. Replace about 10 percent of the water's volume every two weeks. Treat the replacement water for your particular aquarium's conditions before adding it to the tank. Test the water no later than 24 hours after a water change and adjust the pH if necessary.
How to Keep Reef Aquarium Clams
Clams are popular pets to keep in saltwater aquariums because they filter organic material from the water. They are passive, low-maintenance pets, but they require some specific conditions to thrive. Most clams gain nourishment from photosynthetic symbionts growing in their mantles and therefore require bright light. All clams require dissolved calcium and alkaline water to grow and maintain their shells. Finally, clams need exceptionally clean water, because certain chemicals can kill them.