I have a 55 gallon brackish water aquarium that is very well stocked. My two babies are my columbian sharks which mimic each other when they swim. They are getting close to a foot long each. These are the roommates 2 4" spotted cats 1 5" common pleco 1 7" Bichir loach who eats anything smaller than my pinkie finger 1 3" colbolt blue cichlid 2 4" jewel cichlids 1 2" rosy barb 1 3" electric blue cichlid 1 4" 3 spot gourami 1 4" skinny but healthy albino red fin shark 2 3" Krib cichlids I run an aqua clear 50 and an aqua clear 70 power filters. I do a 40-50% water change ever 3 weeks, as well as my weekly 25% changes. I have had an aquarium since I was a kid, but educated myself with lots of reading as well as trial and error. Back then cycle came in what looked like ketchup packs and stunk like rotting fish. I hope I can offer any advice to those who have questions. Keeping a tank healthy is work but well worth it. I look forward to being a part of these forums and getting to know some of you along the way.