Hi
@Hbomb2015! FastBuds Blackberry is very sensitive to nutrients, I had a similar issue with this strain, however I did start feeding before you. Your plant looks a bit dark to me, this could explain why she's having burnt tips (a slight Nitrogen toxicity). Nothing to worry about at this stage, since it does not seem to spread everywhere and leaves are not crispy. Hope this will help, keep us up-to-date and happy growing 👊