Can anyone tell me if Aquatic plants can suffer Nitrogen burn if the nitrates in the tank get to high?I know land plants can be burned was wondering if it was the same in our tanks? Is is possible to get too high of Nitrates for plants without killing fish? Or would fish die before nitrates were that high?

I think the fish would suffer effects before the plants would suffer at all. It would have to be quite high, at least over 50ppm, maybe higher.

No. More nitrates just causes them to grow faster. The burning of terrestrials is typically due to ammonia which definitely is toxic. 50ppm NO3 will not harm plants or fauna.

Cheers,

As far as i know and read, aquatic plants CAN get burned, but with high iron levels.