What’s this?

Just recently moved plant outside, could this be heat stress? I’m feeding cal/mag, bio grow and fish mix, ph 6.3-6.6.

Have you checked under leaves for critters?

Looks like some leaf hopper damage and this won’t help either.

looks like a form of aphid called black fly.

I’ve just checked and there are no critters under the leaves. I will take a look out for those black flies. Any advice on getting rid of them please? Thanks