Dude, Giant Gouramis will grow out of a 225. I strongly suggest you talk to piggy67 about them. i don't believe Plec or i have ever had a Giant Gourami.
And Fire eels get extremely large as well... In fact, I think I remember my friend telling me that they are the largest Spiny Eel and can reach 3ft.
Barring the Pacus and the G, I think the tank would probably be fine...I suggest trying to trade the Oscar and G back in, and begging for your Datnoid back. That's not a trade I ever would have made...lol
But that's up to you...the bottom line is, any tank under, say, 750 gallons with that kind of stocking with even subadult fish of those species is a ticking time bomb.
You know that we are just saying this for the good of the fish, right? I know you are a good guy, and I am not attacking you. But the interests of your fish should be first and foremost for you.