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 (which I already have), 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 large group of schooling fish, such as filament barbs.