By target fish, I'd use rainbowfish (the red ones IMO would look best) or giant danios. IMO rainbows are quicker and more resistant to depth charges by cichlids.
here's a hemichromis lifalilli (red forest jewel cichlid), BTW I'm not taking credit for this photo/fish as it's not mine:
Here is my show male salvini (most sals don't have this much colour):
I would definately not reccomend salvinis for a 75g community. They will terrorize and kill off the other cichlids in there (they are small guapotes). My show male is only 3.5 inches, and he rules a 90g, keeping a 4.5 inch texas and 4.5 inch jack dempsey in the corner. When they breed, they go absolutely berzerk. I had a 6.5 inch male breed with a 4.5 inch female in a 55g, and they killed every single tankmate over the span of 1 night. IMO best left for species tanks or with larger, more aggressive fish.
Even if you get 1 sal, it would still most likely dominate. I had another 3.5 inch male sal who was in another 55g with a breeding pair of cons that were 4 and 3.5 inches. They were about to lay eggs (just finished cleaning the slate) when the salvini came along, beat them both down, and had them up in the top corner all ragged in under 10 minutes. I had to remove him becuase of aggression.
Leave khuli loaches out. As soon as they come out (for food, etc.) the cichlids will catch them and devour them.