Aphids. They actually look more like fleas. Small fish that stay near the surface will eat them if the insects are floating on the water, but they will not eat them off the plant leaves. Aphids can not live underwater, and need something to hold onto at the water surface. One way to get rid of them is to cut your plants back so the leaves are not floating at the surface.
If you use your fingers to push the bugs off the leaves so they float in the water, then fish will eat them, but only small fish. The bugs are too small for larger fish to see them. White cloud minnows, tetras and others will eat them.
The bugs are feeding off the plant leaves, other than that they pose no threat.
Robert Paul Hudson
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