Yea you can never tell they are being light starved until it’s to late, clams close up at night for the most part, John should have asked you about your lighting before selling you a Crocea clam and suggest you go with a Derasa clam, he’s shouldn’t have said it’s easyThat’s the thing in the day the mantle is wide out, whether the mouth is open that wide or not. But I didn’t think he was starving I’ve light just because the guy at aquashella said they will reach the mantle up and out. He didn’t look like he was reaching to me. He did shift his angle to be full faced directly at the light that’s about it. I’ll inspect it when I get off work, but I thought he always looked happy until I looked after the lights went off. After lights out do they usually close up or stay open when nothing is there to asorbe

