What is the Best "pest" in the hobby?

[elysics]

In order to provide a bit of a counterbalance to the other recent thread, what are the rarest, scariest, most beautiful or interesting critters in your tank that are considered pests and immediately killed off by others?

For a start, here is my little rock of horrors where the dreaded black sponge is battling with white sponge, some kind of branching hydroids, and green cyano:

Also, a recent acquisition of mine, a massive colony of a different kind of branching hydroid, it's brown but looks almost red in blue light and dances in the waves:

Anyone keeping a nice meadow of aiptasia or a species tank of fireworms or zoa eating nudibranches?

 

[fishguy242]

Cool thread... @Eagle_Steve ...

 

[Thaxxx]

Mermaids

 

[Waters]

IMO, definitely asterina stars. Was my only CUC in my last predator reef.

 

[N.Sreefer]

Its to bad most of you guys are in the states I have loads of zoa eating nudis if anyone in canada ever wants to start a species tank with them. Little buggers are hard to get rid of but they are beautiful. Some species of paly seem to be ignored or unaffected by the infestation I have, at this point Ill likely keep the nudis.

 

[elysics]

Its to bad most of you guys are in the states I have loads of zoa eating nudis if anyone in canada ever wants to start a species tank with them. Little buggers are hard to get rid of but they are beautiful. Some species of paly seem to be ignored or unaffected by the infestation I have, at this point Ill likely keep the nudis.

Got any pictures?

 

[N.Sreefer]

Got any pictures?

Ill try snapping a couple Im off today and working on my tank so Ill def see some.

 

[ScottJ]

The only 'interesting' thing I have are bristle worms. A lot if them. I really should trap some to thin them out.

But they come out when it's feeding time and scare the bejeebers outa my wife! (that's not funny, Scott)

 

[Eagle_Steve]

I love tanks dedicated to hated critters. I have one also.

Majano, aiptasia and hermit anemones.