Nice clam
Like others mentioned the monti can be glued to a small rock. You can move it around and see where it does best, IME purple montis need bright light to keep their color, but can also loose all their purple if the light is too bright. They also like a moderate to slow current unlike most sps.
sanangelosaltfish1, clams are not hard to keep, that is if you have the proper equipment and knowledge, they require bright lighting, preferably MH, when young they require large amounts of phytoplankton more than light. They also need a constant supply of Ca and carbonates to build their shell. Some clams are much tougher to keep than others, T.Derasa comes from deeper waters, and can live and grow under moderate lighting, T.squamosa, maxia, and crocea can be a little more tricky, especally crocea, they need certain substrates in which to attach their foot, and maximas and croceas demand the most light of all. Daniel Knop has a great book on clams you might want to give a read
HTH
