I have had a 125 gallon tank with a 40 gallon sumo for about half a year now with 15 fish and a shrimp. I have tried seeding my refugium with copepods 3 times and cant get a colony going.my first time my chaeto and copepods all died and dino or something started growibg in my refugium and the water/sand started to smell like rotten eggs. This was after about 4 months. Ithink i didnt have enough flow in the chamber. I added a small pump and an air pump to agitate the water in the chamber and tried to reseed with chaeto and copepods . The chaeto in the first chamber with my skimmer looks to be surviving but the copepods are gone and the chaeto seems to be thinning in the refugium. Any tips or ideas will be appreciated. I would like to eventually have a mandarin