Hi Aquaarche,

I have Garmmrus Scuds in my System, they are all throughout my system in the GB gravel and ST too, and they keep everything very clean, i have not had to back flush my biofilter barrels in about 8 mo or so... they look like your first Pic. I have also had Water Fleas (Daphnia) in my system back in the beginning when the water went Pea Soup Green, and they cleared up the algae in about 2 weeks after they showed up..... I find them every once and a while now......

RS