I currently have 3 55s. 2 40s and 2 10s. I'm getting ready to set up my 75. Just bought a new canister filtration system, that's bad ass by the way, and I can't wait to get that up and running. I have 2 freshwater lobsters. A huge Oscar. A huge Channel catfish. Some very sweet goldfish. A radical "planted aquarium" that never ends. A very bad ass Tiger Shovelnose catfish. I have an Electric catfish, a Black Ghost Knife fish, a Rope fish, a Clown Knife fish, a Lima Shovelnose catfish, an Albino Channel catfish, a Bullhead catfish, 2 Synodontis Lace cats, an Asian Upside-down catfish, a Zebra Spotted Syno cat, a Banjo catfish, 2 Raphael cats (1 Spotted/1 Striped), a Pictus catfish, several Corys, several Plecos (Albino, Albino Bristlenose, Yellow, Spotted and Common), a Parrot fish, a Peacock Eel, a Horshfaced Loach, a YoYo loach and I think that's all at the moment. It started as just a pet for my daughter and it's turned into a passion for me. I love the fish just the same as some pet owners love a dog or a cat, etc. I aim to build my own tanks and ponds in the near future and have more fish. As many as I can possibly afford to take care of. I would certainly appreciate any advice anyone could give me and I'll be glad to answer any questions I can. Peace