Wierd leaf curl Aphid/Russet mites ?

[Rookie4]

Hello, recently i've purchased few clones from nursery. They all came with wierd leaf curling. I dipped them in wettable sulfur and later used abamectine. It looked like it is getting bit better, but after few days away i came and lot of big leafs are curled.
Does anybody know if its pest issue or other problem?

Also they got little nutrient burn because ec of my tank raised like .3 EC when i was away.
Im running Athena pro line at 3.0 EC 5.9-6.0PH

Thanks!