Best Filter For 500g Tank?

I plan on building a 600 gallon plywood tank in the future and I have found an overwhelming amount of mixed responses from people as to which type of filter is the best. I have never really taken a dive into tanks this big so I am unsure as to what kind of filtration would be needed to keep a tank of this magnitude. I have had many filters for tanks 55 gallon and under with varying levels of success, but this is a new ballpark for me. Should I be looking at a big canister filter or some type of pond filter, or something else? I want to keep a single arowana in it, likely with no substrate.

I would like to hear some thoughts and experiences

 

Build a big sump....probably a 150 to 200 gallon sump...it might be cheaper than a couple canisters

 

Defiently go for a sump; there's no way a canister on market (Unless you run like 5 giant ones) will be big enough to turnover all that water. Probably 200 gallons would be best and fluidized will make your life a bit easier. Id plumb it away from the tank to make it easier for you to work with rather than one with an overflow/under the tank. You could get away with a smaller sump; but you'd definitely need an extremely powerful pump to get it going.

And powerheads in the main tank will help as well.

 

Defiently go for a sump; there's no way a canister on market will be big enough to turnover all that water. Probably 200 gallons would be best and fluidized will make your life a bit easier. Id plumb it away from the tank to make it easier for you to work with rather than one with an overflow/under the tank. You could get away with a smaller sump; but you'd definitely need an extremely powerful pump to get it going.

And powerheads in the main tank will help as well.

After some more research into it, I decided that a fluidized sump would be the best choice, thank you for the idea. Would you happen to have any recommendations for a DIY guide to make one? Possibly a blueprint or diagram?

 

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After some more research into it, I decided that a fluidized sump would be the best choice, thank you for the idea. Would you happen to have any recommendations for a DIY guide to make one? Possibly a blueprint or diagram?

Check the king of diy on youtube...he has videos on sump building. I hope the 600g tank is long and not tall as arowanas need their horizontal swiming space

 

I'm not the best with blueprints and such , but we followed these basic instructions.

It the King of Diy tutorial + a subsequent "check" vid

Since it was easier/cheaper, we built the original sump part itself and added the walls as well. But you could always buy one (that is pricey tho) and add the wall mods for yourself

They only thing I had did was increased the thickness of the acrylic (because of availability) and increased the drill hole size/number since we were running a reef tank instead of a Freshwater + we had bigger filter media, so the smaller holes may get "clogged"
The only extra thing I did was modding it with a custom fit lid with holes for drilling to reduce the humidity from the sump and keep down the splashing. I simply siliconed one of those corner gate latches (looks like this: corner gate latches - Google Search to keep it down + easy access

If you have any other questions, feel free to ask!

 

Thank you so much, I definitely have a solid plan set forth now, I couldn't have done it without the advice