Hello there, everyone! I got my 52 gallon (198 litre) flat back hexagonal tank a few weeks ago, we got our water tested 7 days ago at the local aquarium, it was horrible. So, we put goldfish infor the past 7 days, been adding bacta-boost and the water turned out perfect. I got my fish today. I have 4 angelfish, 1 red-tailed black shark, 2 bristlenose catfish, 4 rummy-nose tetras, 4 red-eyed tetras, 2 congo tetras (I think), and 2 mystery tetras I don't know what they are. Hopefully you could help, it will be in a different thread. So, being on this website, I can get help from aquarists without going to the local aquarium everyday for help. It'll save time. :;f Thanks, and great to be on FishLore Forums. Regards, Brock.