No, not really. You should be fine. I added a silver kill coil for good measure.
I also use Pentosin G11 as an additive, as it is supposed to bring down the freezing point if you ever want to chill your loop.
But one thing to keep in mind is that no matter how much ptnuke you add, if you expose the fluid to sunlight it will grow algae no matter what.
This does not really apply for premixed coolants, which are usually fine with clear tubing.