One tridacna of mine changed last week from a turqoise blue colour to brown, It looks very healthy. I had it for about one year and I don't know why it happened.
when was the last time you changed your bulbs, bronw is a color that will absorb more light so if yoru bulbs have decreased in intensity over time then that will do it, also the higher the K scale i am sure that it will turn back to blue.
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