this is a bit snobby don't you think?
125g is a big tank by any realistic measure within the hobby. Not everyone has 5 tanks in their home/facility, nor do they want to. 125g is HUGE by an AVERAGE hobbyist's standards.
I agree with your premise that 5" isn't big for the fish we're discussing, but its a bit foolish in my opinion to claim 125g to be "not a big tank"
I can't agree with you on this point. The adequacy of the size of the tank is relative to the fish you are keeping in it. Is a 125 a big tank when you are talking about multiple territorial, aggressive cichlids that have the potential to be 12" or larger? Absolutely not, in my opinion. Is a 125 a huge tank when you are talking about livebearers and tetras? Absolutely yes. It really comes down to what you are keeping in the tank.