man guy I hate to always look like the a-hole but this ish really boils my blood n especially it's because of some dude online but man how are you going to waste all that time and finger muscle to tell me ANYTHING when you had a Giant Gourami, 4 Oscar, a Pack, and a Green terror all in a 120. Youre cramming 4 feet monsters or whatever size wiki or joe shmoe told you in a 4feet tank. yah information/internet was limited but so was common sense too apparently because you don't need to the internet to see that your fishes has outgrown the tank. but wait your telling me that your Pacu or gourami didn't hit 3-4feet????? JUST LIKE WHAT THE INTERNET TOLD YOU???? hmm....
Yeah I did. Bought them around 15 years ago at the size of 1-2 inches and wasn't told by the aquarium shop how large they would get. When they outgrew the tank I tried to return them, but nobody would take them back as there isn't a market for fish that size in my country.
So my options was murder of innocent fish or to release an invasive species into the local water bodies (not something I want to do).
More importantly I didn't add any new fish in the tank after the Oscar and Green Terror passed away and it was just a Pacu & gourami for half a decade.
And yes the Pacu did grow to 2 feet and Gourami was also a bloody monster at 15-16 inches.
I am now wiser from my mistakes and won't make those again as I now have access to data on fishes thanks to useful sites of aquarium fishes.
It is due to those very mistakes that I don't want other new fishkeepers to make the same mistake I did. But it seems that is hard to understand for someone like you, who wants to pretend that monster fish don't grow big if you keep them in a 10 gal.