Wow thats a really nice selection of fish you have there, it makes a change to see someone who has monster sized sharks instead of the usual oscars, pbass, aro's and stingrays very nice.
How big are those Clown loaches ? they look pretty big !!
Not sure what type of Lobochelius that is ? poss quadriliniatus ? Maybe Melanopterus ? how are you finding it ? only they are scale eaters ! as for keeping them i found they were ok with small fish i.e. Danio's Rasbora's etc but used big fish as food larders !