Different size for each one? Only a really nice answer will get best! No sucky answers.
It kind of depends on how many you get. You could fit a decent school of bluegills in something along the lines of a 125 gallon. Probably about six according to the link in my source. The stocking level is only 64% but the water change recommendation is around 20% weekly which is what you want. I don't know what type of filter you have or will get so you can adjust that yourself and see what it has to say. You can also keep around two bluegills in something around the size of a 55 gallon if you want but then they don't get to school.
For the bass, I would go with maybe one in a 220 gallon or three to four in a 500 gallon. The 500 gallon is a much better idea just for the record. That tool doesn't recommend keeping a bass in a 220 but you should be able to get away with one as long as you have good filtration and aeration. You can plug the bass in with this tool too and see what it says. It was fine with 4 largemouths in a 500g.
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Also just a personal word of advice. What has you so set on these two? You can get plenty of really cool tropical fish like Jack Dempseys, Green Terrors, Oscars, Jaguar Cichlids, etc. That are similar size to bluegills but much more colorful in my opinion. That's what I would get but to each their own. If you like the bass and bluegills then more power to ya. Go for it and enjoy them!
May Poseidon have mercy on your soul ... and help your two gamefish ...
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I would like to add that while bluegills have more body mass, Oscars are longer and larger. The primary concern with keeping fish like this is swimming space, not bio load or oxygen levels. If Oscars are okay, they are too despite the weight difference.
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Also, if you go with the bass, I would go with no more than two in a 500 despite what that site says. You are just going to have to clean more often and spend more on food if you don't. Stores sell enormous lobster tanks from time to time on craigslist too so that's something to consider.
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By the way, people keep things like giant snakeheads and arowana in aquariums all the time and they dwarf bass. Grand Master, find me a largemouth bigger than 3 or 4 feet and I will retract my statement but until then, I see no more problem with keeping them than with any other fish.
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Here we go again with the keeping largemouth bass. We're gonna have such fun ...
Fish Geek, Fish Freak, whatever your name is, I have explained to you time and time again that a largemouth bass needs in excess of 500 GALLONS to be even remotely happy. That's at a minimum. I really seriously wish you would somehow understand that . Bass, whether largemouths or smallmouths do not do well in captivity unless they have plenty of room and lots of structure. They can and will get big. True, most bass that wind up in aquariums die at roughly 2 1/2 pounds which is at around 18 inches or so. But they do get bigger than that. IGFA World Record is tied at 22 pounds, 4 ounces ... but don't forget the foul hooked one that came out of Lake Dixion in San Diego ... she weighed 25 pounds, 1 ounce. Do you think she would have lived very long in a small tank? Hell no. Bass need plenty of room to move and grow. Not to mention the extra room need for an abundance of forage species which they need to feed on.
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A bluegill on the other hand isn't like caring for an oscar or some other large-sized cichlid. Sure, you can start them off in a 55 gallon tank, but sooner or later, they MUST BE moved to one a lot bigger. Say, at least ... 250 gallons? They do get big also, world record is 5 pounds, 7 ounces. That's bigger than any 3 1/2 pound oscar, right?
Anyway, you might consider my answer being "sucky" ... because like a lot of us, you might not be able to afford all that's needed to care for a largemouth bass, but it's all in honesty. And since I'm being honest with you here, I'm looking out more for the health and lively hood of the fish itself, rather than for the entertainment of the fish keeper.
