Rusting tips in veg room - Curling leaves in flower room - Grrrr

OK dunno what is going on here but please take a look.
On one girl, in veg room, you see the rusted tips on lower leaves.
On another girl, in flower, you see the leaves currling completely.

Any opinions are welcome

~ Flower room:

5 gal bubble/drip buckets
Botanicare Pure Blend Pro
Aquashield
Liquid Karma
Cal Mag Bloom

PPM @ 1000 - 1200
PH @ 5.7 - 6.2 (drinking a gal a day si I'm seeing a fluctuation in PH from day start to day end)

Room temps @ 75-80 F
Water temps 68-72 ish

~ Veg Room:

PPM 300 - 500
PH 5.5 - 6.0

Humidity dome
Bubble tote
5 Gal bubble/drip buckets

Clonex
Clone solution
Botanicare Pure Blend Pro

Room temps @ 75-80 F
Water temps 68-72 ish

*RO water only

The curling and the necrosis may be from two different issues. The plant drooping all-over looks to be suffering from overwatering and/or heat stress. The leaves look like overfertilization. Heat stress is usually worse at the top of the plant, near the lights. Overwatering is usually worse at the bottom of the plant. Nutrient burn starts at the oldest and lowest leaves and works its way up.

Hey thanks "MF" repped ya for the input.