can i keep a clam?

clams need very stable water. with 7g's you can have large swings in PH, SG in a very short time. also clams will suck the Ca and Alk out of the water very fast,thats another thing that is not good for clams.
 
Agreed 100%. The lighting could potentially pose a problem. Even if you had a ig MH bulb I'd still thing the size is a big issue. Maybe if you had a 20g sump tied to it or something.
 
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