I'm going to be purchasing a 125 gallon tank in the near future and wanted to turn it into a severum/geo tank. I'm thinking the more colorful severums, such as super red, notatus, rotkeil, etc., as well geo red head tapajos. How many of each species could live in this tank without it being overstocked? I also wanted to leave some room for a group of schooling fish, such as filament barbs.