Help identifying pests

chilledreaper

Active Member
I've just put the plants on 12/12 and wanted to check nutes/ph so removed the plants from the pots to find these little lava type pests swimming are in my water. I've got 4 pots in a gravity fed system (non-recirc) and the pests are almost all white some are black and wiggle around at the top of the water. Can anyone help?
 
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