Can/When can I add a Clam?

I have a 120 G tank that has been set up and running now for about 5 months now and it currently has a Current Nova Extreme Pro 48 in 6 bulb T5 light kit on it. I was wondering how long do you have to wait to add a clam to a tank? Are they like anemones and you must wait a year?

Also, I know I am lacking on wattage, but what kind of clam could I keep once I get to the point where I could add one? I know nothing about clams, ie placement, feeding, flow, etc. Any inputs are appreciated. Thanks

Robert

 

First, make sure ca, alk, and mag are up in the normal range. Alk 7 or 8, ca 350-450, and mag around 1450. I know people say that clams will absorb nitrates and this is true but they will not tolerate nitrates in excess. Then I would recommend a derasa for a first clam. Croceas are cool too.

 

and by mag you mean magnesium?? What are some good test packages for those above mentioned params?

 

How long must the tank be established for?