Athosanswered grow question 7 years ago Burnt tips is an early sign of nutrient overdose; another been the really dark leaves (too much nitrogen).
While the feed strength can be low, the soil can still have many nutrients.
Rule of thumb, if there is no sign of deficiency, then there's no need to feed yet.
Stop feeding for now, let the plant feed from the soil.
With 7 gallons, you might not have the need to feed.
Also don't feed more than once a week.