Hello, My husband, daughter, and I recently started keeping a 46 gallon aquarium and are using the Eheim Classic 250 external filter and Fluval submersible aquarium heater. We have decided to to a Freshwater tank and currently have 11 fish; 3 Sunburst Platys, 3 dwarf Gourami, 2 powder blue dwarf gourami, 2 dalmatian mollies and a cory catfish. I love these guys - I am very fond of animals, all shapes and sizes and have fallen for these little critters!