I think I agree, they do look like aphids, I do see some darker ones, brown or black floating on leaves. Now I have duckweed and hornwort floating. How do I get rid of them?
I had to medicate my tank due to popeye on neons so I am recycling the tank now, which means I really need these plants to help with the ammonia spikes.
I have tetras and ottos in the tank and various other submerged, planted plants.
Trying a Walstad tank for the 1st time December 2013