I saw a monti eating nudi on the glass, how come?

plancton

Active member
a month ago monti eating nudis began devouring some frags, I quickly removed them and they kept changing from monti to monti, until I grabbed a frag and saw I think a pair of them plus a bunch of eggs. I placed the frag in revive and then removed the nudis and the eggs, nothing was left in there.

And for almost a month, I saw no more munching on my montis. Until today I saw an adult nudi on the glass of my tank!

I splat it with my finger, and that´s all I saw, no munched montis, no eggs, no nothing, but the fact that I saw on on the glass is creepy.

How do these guys suddenly appear?, what do they eat if I haven´t seen damaged montis lately?
 
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