Help and some advice needed please

Can anyine help me out just came home from 13hr shift and my plants dint look good. is it nute burn they are fast bud autos??? running NFT system ph5.8 ec 0.4 ..

Need more information., What u have been doing since the beginning?

Ok so I'm running
NFT MD300

Room temp is 26°c
Reservoir a little high at 22.2°c (but roots are healthy and white)
Feed has been PH water 5.6 then slowly added feed over last 5 days or so EC is now at 0.4

https://www.rollitup.org/t/nft-md300-autoflower-grow.924367/page-3#post-13095814
My grow journal if that helps at all.

Are u using calmag?

No just DUTCH PRO grow A/B pH kept between 5.6 and 5.8 and only very week feeds aswel and only over last few days. Would you suggest emptyingy reservoir and putting a fresh feed off pH water and cal mag?.. Only problem I won't be able to do it till Thursday will plants be ok till then