Just to piggyback on what everyone else is saying, the dwarf hovering chain loaches are great...I have 3 in my ebi and they never bother my shrimp (intentionally, that is...sometimes one will happen to get too close for a shrimp's comfort...but they always act as if shrimp aren't even there). If the shrimp are all being lazy and hiding you still have someone to watch
Also, like shrimp, they sometimes want somewhere to hide and chill, so a shrimp-type setup would be great for both.