So be it, my apologies for questioning your integrity.
Let me make an analogy as to what I am seeing. Please remember, this is just my interpretation. When you're driving in your car, and the light fuel light comes on, you know you'll need to get fuel, or the car will run out, correct? The car has this little signal that lets you know this. Well, your clams are doing the same thing. They are not getting enough light. So they are stretching out their mantles to try to gather more light. We, as aquarists, can see this, and we should make the same deduction. Well, I better get more light there, otherwise something bad will happen. Our cars will still operate on low fuel, and these clams can live with lower light, but sooner or later, it will be a problem if we dont intervene. I dont think you clams are on their deathbed, but these animlas NEED a lot of light to thrive. When you've been given the gift of your clams letting you know this, I feel you should do what you can. Make no mistake, it is a gift. Look at many of the thread where people clams die QUICKLY from lack of proper conditions. No warning or symptoms, unless decomposition is a symptom. My suggestion is to increase your lighting to these clams.
How often do you clean it?
