I thought that plants grow best under something between 5000-10000 k
When dealing with nature nothing is written in stone. Nature is fickle. Just keep an eye out for algae on the plants. If you don't get algae in 3 months then the eco-system is balanced. This what I learned from Homer_Simpson. Also according to Tom Barr plants adjust to what ever light they have. They just won't grow the way you want them to if they don't have the optimum light, as trees in the winter. I and others have found that when the plants are growing well algae does not. My theory is that is like crab grass. If something good is not growing in an area the algae starts taking over. Thus some add some floating plants to control algae, like Hornwort.
I think the power glo will be okay, too. Since the spectrum of the light is higher than needed the plants will grow faster and need more nutrients.
A good complete plant fert is CSM+B or Seachem Comprehensive Flourish. CSM+B is a dry fert that will last longer the Seachem which has water in it. Dry ferts can be bought on line from Aquarium fertilizers
I know the actinic doesnt help, but will probably take my time replacing it as it brings out the colors of my rainbows quite nicely.
Now you got me thinking of turning my actinic light on for my Neon Rainbows look pail.
Actinic have a reputation for growing algae but I have seen a few use them on a planted tank. Read that starting out with 5 hrs of low light is best to not encourage algae growth.
If you don't get many responses, which is the norm now, contact Tex Gal. She lives in Texas, very experienced, and very kind.