Is Bigger better?
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Ethical:Yes you can put your fish in a smaller aquarium but they will grow. Any of the larger variety, Tangs, Angles, etc need space to grow and swim. Yes you might be able to put your fish in the smaller habitat but they will become stressed and eventually die. Its like being on subway car or airplane that is completely booked and now you have to live there for the rest of your life. You will quickly find yourself being miserable.
Cleanliness:In a smaller aquarium the wastes build s up at the exact same rate as the larger aquarium (given the exact same amount of stock). that being said, the amount of dilution is significantly different. Mathematically In percentage wise if the fish were to produce 2ml of waste a day in your 80 gallon (302.83L) and you have the same stock in your 200g 757.08L, in 10 days your 80G aquarium will have an 6.60% waste in it as opposed to your 200g which would have 2.66% waste in it. Now of course your 200gallon will have a lot more sand and rocks in it I would assume so these numbers above are flawed because the amount of biological filtration, but the point still stands that dilution is the solution.
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That being said, I am no expert for SWF, and I would never put myself out there as one. But I do work with “large” water filtration systems for a living. I know that bigger is better when it comes to waste.
But if nothing else the ocean is “big” and that’s the way they like it.