Hi, I’ve got a 20 gallon long tank with 7 rummynose tetra, 6 sterbai cory and 1 apistogramma cacatuoides (male, orange flash). Things have been very stable for a year since I established the tank but I’m starting to wonder… what if I got a bigger tank? So that’s my question - if you had this crew and wanted to go to a larger tank, what would you do? What size tank and what other fish? I would love to get a second apisto but don’t want breeding or bloodshed. One other detail: water is pH 7.4 with hardness of 150 ppm.