I'm running a cheato reactor and it is performing better than i expected it to. Honestly I'd rather run a fuge but with my cube I'm really pressed for space. I've seen copopods, amphipods, at least one stomatella snail and a bunch of tube worms set up shop inside. Its been up for a month now and i need to harvest from it and clean since it is pretty well stuffed with cheato.
I run it on a opposite light cycle with led strip lights in a reef octopus biopellet reactor. I also dose iron every week
With the chaeto reactor, GFO reactor, and vinegar dosing i have to feed really heavy to keep any nutrients in the system.
60 cube with sump. Pic is from about a week ago