06-05-2013, 08:19 PM
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The congos not having enough room to chase and escape. Once they get big they will need that 50% larger footprint. They started really beating each other up in the 55 - stopped instantly in the 75. Not that they didn't display and show anymore, but they had more room to maneuver.
The ctenopoma getting aggressive with other fish in the tank. It grows into a large and powerful fish that needs space. I know profiles say they are supposed to be shy and all, but I have raised 2 from the size of the end of my finger, to 4 inches (not full grown), and both were quite aggressive - first one so much so that I gave it away and started over with a new one.
You'll know when it's time.... you'll start to get a sense of unrest when looking at the tank. You'll start to feel the angst in the tank. At least that's how I determined it was time to upgrade. The only reason I moved them to the 90 was because I sold the 75 to make room for the new 125.