I don't really know, but I think I would be inclined to swap out the tubes... even half to start if I didn't have a lot of cash.
theres others using 5000ks with no problems, maybe get some cheap 6500k normal fixture to fill in the gaps and be fine, not totally sure tho
I'm not too concerned about the temp of the lights. I know that it's not ideal but will work and I do have mostly 6500k lights. I'm more concerned about the afterglow and wondering if it will create hermies.