I always tell people living things love to make liars out of us;HilariousI would normally say you shouldn't have bryposis in a tank so new, but I got it in my nano also and fairly quickly into the uglies stage. I've also never seen it grow on glass, it's usually on the rocks but here this hobby goes, proving me wrong again.
For your nitrates, I wouldn't worry about them too much. After the 14 day treatment, just perform a 'large' water change. 5 gallons should be plenty. Make sure you heat it and match salinity with your tank. I'm close to the end of my 14 days and I'll be doing a very large WC. Close to 90%
I was careful to inspect the rubble my boss gave me from his tank and didn't turn up and although I didn't see any I forget to ask my boss if he had specific algae issues, that probably explains why its in such a young tank because his system is 5 years old. I got some 150 mg fluconazole capsules today and figured that with the rock and all the equipment I'm probably dealing with 8-10 gallons of water so I was going to just do one capsule (at 20 mg per gallon that comes to 7.5) I just did a water change earlier today so now I just have to remove the carbon and add back a little of the removed water (forgot about the displacement of the carbon). Do you think that dose should be sufficient? I got a second capsule just in case but I'm not sure I trust my judgment enough to guess a half dose.