Not a JD expert but with my 2 females GTs when they're both dark they fight for
dominance and eventually 1 will be darker then other (dominant one darker).
Clown loaches should be in groups of 6+ and i've seen them in with good sized breeding red terrors
and stuff so i'd imagin they'd be okay, don't qoute me on this though lol.
cheers mr proxo !!!