My first clam came as a birthday present, a 5" derasa, had the tiger spotted marking.
Second one is similar to the one below, also a 5" derasa, with a slightly lighter color. That one unfortunately died due to disease introduced by another clam.
The current clam I have is between 8-9" and has beautiful stripes down its mantle.
In many people's opinion, Derasa clam is one of the hardiest, and easiest clams to keep.
In my opinion, squamosa is the hardiest and easiest, but Derasa clam is a close second.
Like all clams, it does require full reef water condition with extra care in calcium level for proper growth. It will also need slightly nutrient rich water (i.e. plenty of fish waste) to thrive as it absorbs phosphorous from water to build its body parts. Hence it's nearly impossible to keep clams in an aquarium with no fish in it.
Although Derasa doesn't require as much intensity in light as Maxima and Crocea do, it still need a decent light source. I've been able to keep it healthy under power compact at at least 5W/gallon with slower growth. Currently I have it under my AI sol blue LED fixture at around 70% at peak time and it's growing rapidly. Many others keep it under Metal Halide, which is more than enough light but can really suck up your energy bill.
Unlike Maxima and Crocea, you should place this clam on a sand bed. And give it plenty of room to "rotate" as it has a mind of its own in choosing what direction it wants to face. Lastly, keep the tank free of potential clam eaters. I had a flame angel who would nip at my Squamosa before. That flame took its own life one day, and my flame angel II has been very well fed and has not touched the clam.
One other conscience complier is that most of these clams you find in the trade are now aquacultures with minimum to none impact to the reef. And the bonus of aquacultured livestock is they are far hardier than those wild collected.
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