hi there Bullmark, Fishshit is basically kelp extract right? so this will contain quite concentrated doses of N as well as some kinds of stimulants for "rhizosphere" microbes. Meaning it's good for the vegetative stage but it can cause things like a rising soil pH and undesirable root zone microbes over time. The truth is, you're still doing well, the burnt tips are not serious at all, the root zone issues neither, just keep doing what you're doing and avoid more feeds, nothing you can do about the amended soil, and like i said, it's not a big deal at all. In about 2 weeks or so you can consider adding more nutrients, but until then, put her in cruise control and just ride it out watering exactly like you've been doing which is totally fine. hope this helps ! 🚀