Holes In One Of My Leaves

[grumpygrowers]

Not quite sure which insect has been feasting on my luscious green leaves but I want to kill every ******* one of them! There is only one small hole on one of the leaves and only one of my 8 plants has been eaten. I have sprayed a foliar bug spray that I got from my local hydrophonic supplier onto the plants and tomorrow I'm investing in some stockings to cover all vents.

I know I should have got them in the first place as my mate lloyd sed but i forgot