30 days flowering and leaves are burning

hey guys ok im 30 days in now and my leaves are starting to burn and curl in the heat is fine 70 . i use gh flora mix 2 tsp (10ml) micro, 1/2 tsp (2.5 ml) grow, 2 tsp bloom i havent checked the ph i need to buy a kit
i was thinking it might be because im growing in pails that are to big ( the water never drains out of the holes ) maybe buildup in the bottem from the ferts ?
any idea's on what it is and how to stop it ive looked for similer problems but havent found any that look like this

could be mother natures normal process, or it could be worth chopping the entire plant down..

look into the stage at which you are at more.. 30 days into flower, this seems normal...

you need calmag

thought so just baught it thanks