Montipora eating nudibranch

[Duckhams]

We've had these a couple times over the years. Manual removal, preferably at night when the little buggers are more active is best. Shut off all powerheads and pumps and get a siphon tube ready.

Its much easier taking the whole thing out of the tank but i've done this too. Use a flash light and scrape off any egg clusters, then use a toothbrush to scrub the underside/edges of the monti to remove any leftover nudi's / eggs as you siphon out water/debris as you go. You might have to do this a couple of nights in a row to get them all, but thats always worked for me. Most monti's recover pretty quick.