Yup, reckon they came in with some Pogostemon Helferi......... Sad really, don't like killing anything, but that plant looks sorry for itself, and they started on my Cabomba.
Found 9 of the little buggers. Said sorry to all of them, but they are now despatched. I only have a little 35l so it wouldn't have taken them long to decimate the plants.
I have always tried to give hitchikers a chance, but once, when I kept marines, a Eunice worm killed 3 of my fish, one being a gravid Greenbanded Goby, and it had my lovely Emerald crab
I learnt the hard way I suppose, but always try to consider the possibilities of leaving them be, but in this instance, well, I don't think it would have been sensible to allow them to stay.
I have never seen that before.. maybe you've just discovered a new species?
Oops, well, if they were, they're no longer......Shuffled off their mortal coil and all that