What semi aggressive fish would fit in with these fish?

[Deep Blue Sea]

glad to help, not sure if they ship to the UK but heres a website that sells African Butterflyfish for $14

http://www.thatpetplace.com/Pantodon-buchholzi-african-butterfly-fish-208497

 

[Chicxulub]

He wouldnt sit still for more than second so pic of the shark is a bit blurry. Had him since a baby about 3-4 years at least. The pleco made the shot eating his fill of peas. Ill take some decent shots of my tanks and fish over the weekend and put them in my profile.

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He is actually pure black (and red) dodgy photo work is all Doesnt get fat either with all that chasing around he does.

I love him! He looks great!