Ok thanks! Actually, I suspect they arose out of nowhere in the assassin tank because that tank was in the kitchen window where it grew algae. And the roots of the salvinia had a lot of algae. They have it mostly cleaned up, I like how efficient they are. I would like to find out more about them, what would eat them because they;re so small I don't want to raise them for nothing and already my population has grown in just a day.
Skuds.. That's a new one. I'll go look them up, I don't know about all these aqaurium bugs! I'm happy to know that s shrimp are present in healthy tanks though, right?