Definitely looks like Dino's to me. I had them a few years ago and conquered them. Drastic measures though, you need to do an entire blackout over the whole tank for at least 4-5 days. Garbage bags won't work though, they are too thin and some ambient light will still penetrate into the tank. I used my motorcycle cover to make the tank pitch black. Try it, your tank will be ok in about a week. ( tank has to be in TOTAL darkness)
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Last tank was 210 reef with 90 gal sump
120 , lps. 2xKessil A350W Tuna Blues, 2xvortech mp40 for flow,aqualogic 1/4 hp chiller, 160 lbs live rock. sohal, , pair of percs,flame dotty back , royal gramma, pair of black percs, niger trigger, mandarin
55 corner bowfront freshwater, African cichlids kessil a350
30 gal 36x36 coffee table fish tank. 3 red ear sliders.
5.5 gal nano, live rock, arrow crab, baby perc, firefish.
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