agressive tank questions

[swnewbie10]

I have decided to change my original idea of a sea horse tank into a more aggressive-styled one. I intend on keeping the following species in my 40 gallon tank.
FISH
chain-link eel
fuzzy dwarf lion fish (Is it possible to keep two together if I introduce at the same time?)
Clarkii Clownfish
Saddle Valentini Puffer
INVERTABRATES
bulb anemone
some species of crab(does anybody have any ideas?)
feather dusters
Longspine Urchin
Is this set-up okay?
thanks for all the help!
p.s. Can I keep any shrimp in this tank?(particulary harlequin shrimp)
What type of filtration works best in this type of system?

 

[aw2x3]

IMO, the tank is too small for your choice of fish. The Chainlink will outgrow it, the Fuzzy would be cramped, the Valentini would nip/pick at the Fuzzy and the Clownfish would most likely get eaten.
Invert-wise...pretty much anything would be eaten by either the Chainlink (since they're primarily invert eaters) or by the Valentini.