Speaking of big fish, I'd suggest upgrading the kuhli loaches to dojo/weather loaches. They look nearly the same and act the same, but they'll be more readily noticable in a 125 gallon tank. They also react to barometric changes, like the name "weather loach" suggests.
And yes, plecos are poop machines. It's just so rare that you can actually suggest a common pleco and be right. Normally you're letting people know that their 3 inch common pleco is going to grow out of their 10 gallon tank in about 20 minutes.