I have several plants with varying problems, so I'll post each problem as a separate conversation. Here is the third and last:

I have started a Phoenix variety plant from a cut sucker. It was going great, and then the leaves suddenly started to go limp and get full of very tiny holes. This has happened over just the last couple days. I have seen some very small flies with black and dark green bodies around the plants. They are similar in size and shape of whiteflies, but they are black. I haven't seen anything actually on the plant. Just a few flies around it. Picture below. Any thoughts?