nevermind. I'll go through trial and error. without the violent sunrays, high potential of algae build-up, many obstructions and only 6 fish or so, I wouldnt see why my "580" gallon would need anymore filtration than a 125 with the same community. The only problem I can suspect is the lack of water movement which may lead to growths of unwanted bacteria. This will be corrected with aeration and surface movement. I want a quiet, gentle, natural environment. Not 100 gallons of water disrupting the surface every 30 seconds and the fish being blown in a thousand directions. Its a fish tank, not a fish-jacuzzi. It just needs to be clean. correct?
I'm not one for not caring for my fish. I do weekly 50% water changes in the 55 gallon while the Pacu are juvenile. I may adopt a certain Silver Arrowana at the LFS if all goes well with the Pacu... I feed them once a day and have the light on for a period of 6-8 hours (depending on how long I have time to look at them in my spare, non care-taking, time) but at least 6 and at the absolute most, 10.
I just don't see the need for military-like standards of filtration. Is the Baltimore Aquariums 260,000 gallon tank (inhabited by many thousands of creatures) cleaned with a 1,040,000GPH filtration system... Probably just a very efficient, and advanced filtering set-up.
excuse the typo's