You should probably flush the radiators out for a good half hour with warm tap water, this is best done with the rads outside of the case.
Also for your loop did you include the needed parts for a drain port? This will make maintenance now and in the future easier. otherwise you will have to remove a fitting to drain the loop and likely spill all over the place.
Mayhems has their Blitz kit that flushes out the system before adding your coolant but the last time I used it it was very bubbly, so the drain will also help here. I ended up flushing out the blitz about 5 times with distilled water before filling in my coolant the first time. After like the 3rd revamp of my loop i included a cut off valve that will allow me to reverse the direction of flow from the res without the use of a pump. for example if i have my bottom rad right below the res and the drain after that, I could leave the drain open and flush that section really nice, but it would never touch the rest of the loop. So I put a cutoff valve there so the water would be force through the rest of the loop while filling from a distilled water jug for an efficient flush.
otherwise i would have to fill, seal, run, drain and repeat several times and this got boring fast, not to mention how much time i wasted letting the system run for 5 minutes here, and there.
Hopefully I didn't go off on too much of a tangent but in a nutshell, flush rads only with warm water, assemble loop and either flush with distilled water or blitz kit, and include a drain.
Take this advice with a grain of salt though as I am not the most experienced water cooler ever and I am sure someone will come along soon and add in some more advice.