sick northern blue light

This plant was growing out of control at the start, fim worked, then brown roots and stalled growth. Realized ph was an issue and flushed. still not looking great. Applied h202 to roots last two days and started nutrients again today after keeping ppm near 300. it's been about a week since i fixed the ph levels and it still looks bad. recomendations ?

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Still looking frail but new roots emerged from the net pot and have finally gotten in the water. Should i cut the old roots off or just let them fall away naturally and let whatever is still working stay ?

You must change pH rate slowly in the soil ! It's more harmful for the plant to switch its pH, than being in the wrong pH

You got enough air bubbling in those buckets? That looks to me like the roots want MORE OXYGEN.