Leaves Have Little Knats On Some – Not A Lot . Stems Appear To Be A Lighter Green.

Question

Edges of leaf are curling. In an 8” pot.

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Answer 1

It is very difficult to say what that is, since it is hard to see. This collection of articles will help you to use pesticides off all sorts, but many will overlap, killing a broad range of pests:

https://www.gardeningknowhow.com/plant-problems/pests/pesticides

This article will help you to care for Coleus in container:

https://www.gardeningknowhow.com/ornamental/foliage/coleus/growing-coleus-in-a-pot.htm