Those are white that feed on mollusks, but they look the same. I would take them out if you have clams. Being they are near the base. The other two flat ones on there are OK.
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150 Gal system 3'x3' 400W M/H, Bekett skimmer, Dart return,1/4 HP Chiller
180 Gal Drop tank, LED lights, Bubble master 250 skimmer,Hammerhead on a closed loop, Speed wave return.
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