600 gallon aquarium filter

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At the end of the day, the simple answer is you’re going to start with an external canister filter for a tank that size and go from there.

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Probably more than one.

Look at a Fluval FX6 to start.

ETA: ideally you’d want a sump system for a tank that big. But a couple of large canisters will do the job also.

Do a sump setup for a tank that size

I pretty much want to do the native fish in south Louisiana (all the variations of bluegill, largemouth, catfish, gar, and sac-au-lait)

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I pretty much want to do the native fish in south Louisiana (all the variations of bluegill, largemouth, catfish, gar, and sac-au-lait)

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I wouldnt do a large variation of fish.

Plenty of local species are mean as hell. Perch will put a hurting on other fish in an aquarium. They are bullies even with other perch

Largemouth bass can and will eat all fish smaller than them.

Catfish can be mean as hell also.

About the only docile fish is the gar, and they can get incredibly big, or at least too big for aquariums.

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The tank will be the cheapest component.

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I used to have large aquariums. I often thought that a pet store could give the aquariums away because the real money is in everything else. You are correct.