Strange leaf shape caused by poor roots? pics!

System is DWC 5 gal bucket with FF neuts. 400W HPS air temp 78 max water temp 72 max.
The strange leaves developed in early flowering week 4-5. water does not smell bad but slime is on the net pot and the roots. The roots are also seem dark.

could be heat stress? that can cause leaves to deform when they grow. I've had a few plants do that to me because of heat stress. the leaves grew normal later on in the plants life

I'm going through the same issue. Read this: https://www.rollitup.org/marijuana-plant-problems/150004-plant-moisture-stress-symptoms-solutions.html. I'll bet its due to nutes being too strong...same thing in my case. Backing the EC down has them looking much better.

That rez looks like fish soup.