Do you have any problems with aggression? Do they interact much or avoid one another? It's cool how much color variation there is between them. Is that always the case or do they change with mood?Here are the 2 flatheads I have.( idk why I thought one was a bullhead, turns out it's a flatty) they are doing well in the 450 View attachment 1030147View attachment 1030148
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One thing I'm hoping to do is get the flatheads off of live food. If I can't manage that then I like your idea, but wouldn't the flatheads just eat the adult bluegill at some point? I'm also hoping to get a longnose gar in there as well.Any thoughts on putting a couple dozen blue gill in the 5500g? They would be able to provide food for your flathead, and a couple dozen might be able to reach self sustainability levels.
Side note: Whats wrong with Madtoms? They should be great for your 40g.