I use a hang on filter with cheeto inside, i have two astrea snails and one hermit crab. I also have bunch of tiny snails from reefcleaner (those came from my main tank at home) I have one clown, two sexy shrimps. For coral Monti seems to thrive in the tank, xnias, zooanthis, pavona coral, small pocillipora, and birdnest that are doing fine. I tried to put a small acro frag, and didn't do soo well. Not because my lights but i think because i don't really dose anything in the tank, just small weekly water changes with esv salt. I really dont test it either, just use a refractometer to check salinity daily. My biggest challange has been the salinity and that the surface of the water gets really dirty. Obviously i don't have a skimmer. All in all the tank has been running for a year, without any issue, i started with a damsel, but he jumped, the clown seems to stay put.