Not sure what these are, but they just seem to sit there and do nothing. Got some Salvinia from a member on APC and now I'm seeing a handful of these things hanging out on it. Any idea if I should be concerned or try to eradicate them?
I believe they are aphids. I got some on some floaters (Salvinia and RRF) that I got from Aquabid. They can get to really high numbers - and some floaters seem to suffer some damage from them (small brown spots) - others don't show any signs of damage at all. I brush them off into the tank for extra fish food when I see them.