is my tank over stocked?

I have a 125 gallon with 2 emperor 400 filters with bio balls in them as well as the cartridge a crappy regent 30-60 gallon filter that I had laying around with some deepblue nitrate reducer media pad and a canister c-360 filter with lots of bio balls and 2 layers of more of that nitrate reducer stuff and 1 layer of the advanced poly fiber media pad

1 senegal birchir 12"
2 reticulated stingrays about 6" disc
Black ghost knife 5"
8 filament barbs range between 2" or 3"
10 silver dollars 4" or 5"
And on Thursday I might get a red arowana just because it's going to be so cheap I might not be able to resist

And I have this current maker that I found

FormulaTank said:

Isn't that aro going to get too big?

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I have plans for future upgrades when 1 thing outgrows my tank

KiiNGGiiNGER said:

If you get the arrow just know everything besides the rays will be food very quickly.

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No they won't I've had a silver arowana that was around 18" with 4" silver dollars just fine the filament barbs may get eaten but the arowana that I might be getting will probably be around 3"

Thekid said:

Then why are you asking?
Where are you getting a red Aro in Miami?


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I'm not asking if the fish are compatible I already know all of that. I'm asking is my tank overstocked? Which I'm sure someone's gonna say yes I just wanna see if my filtration can support it?