I'd run some nitro in it initially.

Lack of nitro will make the engine more difficult to tune.

You should break it in first with Nitro then start backing off only after you have it running reliably.

I've never run an engine with NO nitro, but I do tend to run most of my larger glow engines with only 5% now-a-days.

The tuning "window" is just a bit tighter, but the engines run well... and the cost savings is substantial.