Why do these tips appear to be pointing slightly downwards, they look like hooks?

Nothing good or bad, the plant is like a balloon made of sugar filled with water, oxygen. The more turgor pressure that exists from transpiration, the more pressure the plant can utilize. If they are bending sideways, then it is denaturing of enzymes (too hot), or not enough cooling over long days. If it's just a little droop, then it's just because there is not so much water movement (osmosis), the slower water moves through a plant, the less pressure it has to play with. Reasons why water movement slowed can vary. Either in the medium or the RH of the tent itself. It's crucial to maintain adequate oxygen and a suitable pH for nitrification when using organic nitrogen, as the process relies on aerobic bacteria that require oxygen and are sensitive to pH changes. Low oxygen inhibits these beneficial microbes, while improper pH levels, typically a narrow range around neutral, significantly reduce their activity, potentially leading to nitrite buildup. Biobizz is nearly all organic nitrogen, so it all has to be broken down before a majority of your nitrogen becomes available. The thing about it is that during this process of conversion, the nitrogen has both a + and a - charge. If the plant/micros can't finish the breaking down process or the process becomes crippled due to a lack of oxygen in a plastic pot with zero diffusion then all that nitrogen is locked in with that charge If a plant goes over 20% ammoniacal nitrogen, bad stuff happens, so it's more or less vital that the final breaking down process of nitrogen does not get stopped or slowed. Ammoniacal nitrogen is a cation, similar to calcium, magnesium, and potassium. The plant was looking a little lime coloured. Nitrification and the rate of conversion is linked to pH in a medium. Nitrification occurs around 20% efficiency at 6.2 than it does at a pH of 7. If there is even a whif of oxygen shortage, anerobic takes over. Understanding that and the importance of keeping your pH in line at all times, especially when using 98% organics.

Leaves would be turning yellow if it was Nitrogen related and Phosphorous causes dark leaves. Her color is fine. There's a good web site with pics and descriptions of common issues, put "11 common cannabis nutrient deficiencies" in browser search. Several things can cause this, heat stress, over watering, nutrient toxicity. Any kind of stress. Toxicity usually isn't as much a problem unless your careless with feeding and not proper PH. You have to have the proper equipment to avoid having major issues with your grows. If you have a good growing environment and light distance it's most likely your watering habits. My whole pot is dry when I water, not that 1-2 inch down being dry. I use the lift test. Pot will be really light weight when time to water and even some leaves drooping. Look at my weeks 4, 5, and 7 of the "another grow with CBD" diary and how my plant looks before and after watering. Tips will turn yellow/brown if nutrient related but light stress can also burn the tips. Nothing major as of now, some of mine do this at times. It's suggested by most to start nutrient feeding at 1/4 of recommendations and increase to full strength over several feedings. Good luck

N-tox does cause clawing, but i don't see dark or glossy leaves... If you do something starting today, i would drop N 10-20% while maintaining other levesl of typical fertilizer that you add according to the schedule. It looks minor and slow-moving, so it should not require a major change... just a little off on what is provided over time. You also might want to see how it progresses... again, a benefit of a mostly healthy plant and a slow-moving problem. Take a moment to look at color of your leaves with normal room lighting and not a grow light... they may be darker than they appear under a grow light and that would help be more confident about the guess.

too much N, try to give less biogrow, use the sheet but divide it by 1/2 or even 1/4, next watering without nutrients