300 gallon aquarium from glass cages filtration question

  • We are currently upgrading MFK. thanks! -neo
I have 2 fx6s I picked up on Black Friday for 170 each, and an aquaclear 110 to use for the 300

but I also have the option to pay an additional 1200ish for sump, drilling, fittings plus whatever the pump cost so an extra 1500 if I go with sump system

Money is somewhat tight
but this is one of my dream aquariums and I want it done right, stock is small now but when the clown loaches and King Kong parrots get bigger I would say it’s running at max capacity in 2-3 years

i can keep the fx6 for other aquariums in the house too,

which should I do?

I used two FX5s on a 320 for several years and they were more than sufficient. No carbon and each tray filled with Ehfisubstrat Pro.
 
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