Checked out your fish. I also had Elonesex in mind but I dont know If I can make the LFS bring some in I will try.i would go african tank,
-black knifefish /Xenomystus nigri (aldo u wont see this one at all since it will mostly hide and be active at knight) Other knifefish species get to big, so be sure its not the american variant but the african black one.
-some smaller mastec. species could be fun
-would def get 1 pantadon butterflyfish they are awesome
-rope eels are really cool, they do can get massive around 50cm but that might take around 20 years or so.
-you have some similair hejuta look a likes like : elonesex belizanus aldo hard to find
some smaller pike cichlids? like crenicichla regani but those need a very short range ofwaterconditions as ph .
Or i would remove all the fish you still have and go
erythinus eryhtinus
or remove them all and get a dwarf snakehead.
I believe Pike Cichlids need harder water and Cichlids in general are kinda Semi aggresssive so no no for my Bichirs.
I will DEFINITELY get an African Butterfly aka Pocket Size Arowana LoL my LFS brings them in regularly.
Might also check out Peacock Eels . I know my LFS brings in Spine Eels from time to time but they are babies and I mostly dont know the species . I am scared that the one I decide to get will end up being too big for the tank.
Wont remove all my fish and go Snakehead or Wolf fish tho they are cool but I cant give up my Bichirs LOL.