I would go with a crocea or a maxima. They are smaller and more atractive. Clams do better for me in higher nutrient systems, so I would not worry about a crocea or maxima being hard to keep. In my opinion the aquacultured ones are extremely easy to keep, but the imported ones are very difficult. In a ten gallon tank, a clam will probaly aid in the filtrations of nitrates.
Here is a picture of my aquacultered crocea clam in a bristle worm infested 20 gallon. This tank uses 2 55watt pc's so your lighting will be adequate
Here is a picture of my aquacultered crocea clam in a bristle worm infested 20 gallon. This tank uses 2 55watt pc's so your lighting will be adequate