Happy growing man... I personally don't suggest any "long-term" slow feed nutrients because look at its NPK ratio of Miracle-Gro Performance Organics: it's 9-2-7. The ratio is recommended for vegetation but cannabis has its specifics of NPK during vegetation and during flowering. slow releasing nutrients are good to a certain point but you really can't control the NPK ratio that cannabis needs versus Trio products such as micro, grow, bloom.
You're also growing indoor and temperature is very high. With miracle grow, you won't be able to control its PPM either. Remember, during high heat, cannabis is more prone to heat burns and gets easy nute burn as well.
Remember, during vegetation, you need high N, low P, high K. During flowering, you need low N, high P, high K. Of course, individual plant will ask for individual needs but that's why we have to assess our plants and implement its needs accordingly.
Autoflowers are time sensitive and as a grower, you need to do your best to vegetate as much as you can. Generally, ruderalist vegetate for about 3-5 weeks before switching to flowering. If you mess up during vegetation, the outcome will be poor. Bigger the plant: bigger the buds.
700 PPM at week 1 will certainly destroy, if not, atomize your babies lol. And your temperature is high, imagine that? babies are more prone to stress, especially if the environment is not met! Soil has enough minerals to keep your babies going for about the first week. 700PPM is way too much.
What's your PPM on the tap water? higher the PPM on the tap water, less room you have for your nutrients. PPM in the tap water accounts for all the natural minerals such as calcium and magnesium.
Many growers use Reverse Osmosis water because PPM is usually less than 20 and in that sense, you have more room to add nutrients, therefore, a better control of what you're putting into.
Lot of information but cannabis is very sensitive and specific to its needs. Take this grow as a learning lesson. We've all been there.
Cheers mate :)
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