My 4 1/2" Sen left the 2 1" loaches alone...they were too quick for him... He was hell on a small peacock bass though! I was surprised that the bicher caught the bass...
You may run into issues as they grow, clown loaches are relatively slow growers. I don't know about delhezis yet(yet!) but if their growth rate is similar to the senegal's rate it will outstrip the loaches pretty quick. I'd bet money Anne has a growth chart.
I keep pols with clown loaches. The biggest bichir is 15"+ the smallest around 8". The clowns are only 3-4". I think the only way they survive is they go to bed in their hollow log before the lights go out.