Help ID these bugs

steven1025xiao

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My 150G tank has been battling these bugs for months, they seem to move slow but attack corals fast. They look like tiny black spots and only can be found nocturnally moving around the base of my SPS tank.
I have tried drastic interceptor dosage 100-200mg for 150G and they seem to be stale when meds are in, but they come back after a weekish. I have treated my tank with interceptor each week for a month already, but they are still there.

Today I tried with invermectin dip (10mg per 4L), they come down from corals but still swims around!

I have attached microscopic pics, please help.
Thanks !

IMG_4455.jpeg IMG_4454.jpeg IMG_4452.jpeg IMG_4450.jpeg IMG_4449.jpeg IMG_4448.jpeg
 

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