Oh good, not a danger to the fish or shrimp. Thank you! Must be the plants they're going after. This tank grows very little algae between the number of plants and the light stocking. They do like to hang out in the vals, especially the ones that are starting to get ragged edges.
I'm assuming anything that would kill them would probably kill the shrimp too, huh, being inverts?
100g planted community tank
75g planted goldfish tank
29g planted betta community tank
5g planted Betta tank