Actually blue light is great for plants. I've seen house plants grown under VHO actinics that were lush, fat and very healthy. Blue light forms stocky green growth, great for the vegetative stage (preflower).
I started off with one of those CSL 50/50 actinic/10,000k bulbs. It seemed like the plants were ok, but the algae really loved it. But then it was my first plant tank so take that into consideration. Although things did get easier when I switched to the 6500k bulb.
I didn't like the stark, cold white/blue light it cast. I personally prefer the yellower lights like 5000k, especially for a blackwater tank.