According to the below info, I would say if you have a low light situation go with a derasa, squamosa, or gigas. Hippo would prolly work as well. However, having said that, be sure you are using Kalkwasser or something like that for calcium needs.
Here's ME2003's notes from Barry's visit:
Acclimation.
Clams should be put in tanks with specifications within this range.
Temp 75-82 Higher temps causes more stress that in the lower range.
PH 8.0 to 8.4
Salinity 1.022 to 1.025 ( Parts per thousand is actually a better
way to define salinity. We had a disscusion on accuracy of equipment and measurements.)
The drip method is the best way to acclimate fish,SPS and clams.
Clams are usually hardy enough modify this slightly to add a
1/2 cup of your tank water every hour. Do not put water from the bag into your tank ( a little as possible ) Barry sends acclimation instructions out with the clams. Acclimating clams to light is very important. Reducing photoperiod or placeing lower in tank and raising are some ways to
adjust light until the clams acclimate.
Metal halides work best for clams although customer have had success with clams under PC or T5 -n shallow tanks (12-14 inches)
Derasa,squamosa, and gigas require less light than crocea and maxima. They use Ushio 10 k bulbs in their holding tanks.
Clams from easy to keep to most difficult
Derasa almost bullet proof
Squaosa
Gigas
Crocea Difficult high light.
Maxima Much more difficult
Small clams (~2 inches have a high mortality rate)
4 inch clams are a lot easier to keep.
Ultras and electric are the most vibrant colors.
Pinched mantle is a problem that was very prevalent
a couple of years ago. Not as many lately.
Fresh water dip ~25 min in RO water at the same temp
as tank. Shake the clam to get water to the area infected.
This is stressful and may kill the clam. There is a chapter in the book that discusses clam troubles.
It is a protozoan that causes this. They have not indentified it yet.
Giant Clams in the sea and the Aquarium James Fatherree
is a new book out and has a lot of information on clams and their care in the aquarium.
( Denise and a couple of other people bought a copy. Since I already have homework maybe they will do a book report review)
Clams Direct follows up on clam purchases and uses this information
to improve the quality of the clams shipped. (IMO this is a practice that all companies should follow. The mortality rate of fish, corals and clams is to high)
Disclaimer
These are my notes and may not accurately represent the presentation.