Hey there! I recently purchased a 150 gallon aquarium along with all of the filtration and setup required, which is a huge step up considering I've only ever had a 55 minus the larger DIY ponds I've built lol. I currently have 4 silver dollars, a common pleco, and a Jack Dempsey in the tank. That being said, I want to add a few more fish, nothing to make it too crowded but maybe a few other large specimens or even smaller guys that are more active since the Dempsey and Pleco hide most of the time unless the lights are off. If anyone has any recommendations please let me know, I love this hobby so much and I really wish I had a 250 because I'd love to keep a spotted gar or Arowana as they are my favorite type of freshwater fish. Let me know your thoughts! I really appreciate all the help.