Does my tank livestock?

Hi
I am new in this forum,I just have a question about my fish tank,my fish tank about 300+ gallon(96*29*36) and I have about
2 arowana about 20"
30 bloody parrot 6" to 10"
6 severum 7" to 9"
And couple more different fish and 5 big 16"sucker fish
So my question is: Do I have too much fish in my tank? Because sometimes I have fish die with out reasons,that fish still eat and swim the day before it die
I have sump filter and 1 fx5,1 fluval 406
Do I need more filter?
Thanks for all advice
Tom

Thanks for your answer,that what I think so I will sell some of my parrot

Thank, do you think my tank will be ok if I put one more fx5?

This is my tank, does it look to many fish in there