Good luck.
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I'm sorting very little information, but a lot of opinion/emotion. That's my conflict. I have not made a decision. But I take issue with a lack of a academic approach.
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I was leaning away but this article brought up some very good no subjective points about this conversation. Ultimately it's about the ability for the fish to thrive in captivity. This is a full grown 5" purple tang that has been captive for four years in another tank (90). Based on his professional opinion my 40 breeder option is feasible. If I start to see signs of the fish doing anything but thriving I have friends with very large systems that would be happy to take this one.
"Now, what DOES work is to compare the length of the fish to the open water area of the tank (length plus width). Put this into a ratio to facilitate comparisons between tanks. For example, a 4-inch angelfish in an aquarium that has an open water length of 40” and an open water width of 12” would result in a ratio of which reduces to 1:13, an adequate minimum amount of space."
"Zebrasoma are also more attracted to bottom structure."
I'm going to take the purple tang, but not the powder blue.
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Wow TP really do exist!
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Ive seen purple tangs much larger then 5 inches. I have a four inch white tail bristletooth thriving in a 36 inch 65 gallon swimming next to a 5 inch Melanurus Wrasse in my Barebottom Reef. They actually swim together in my overstocked tank and both are Monster's when its feeding time. I think for anyone to argue about taking Wild animals and putting them in any tank thats not the size of the Ocean is stupid. Should you put a larger tang in a 40, maybe not. The amount of filtration you have going, how often you do water changes, what and how much you feed will eventually be the answer if it lives or dies. Some fish just dont make it in any size tank. Goodluck with what you decide to do. Just remember this hobby is probably the most opinionated hobby Ive ever been a part of and when you throw that question out there be ready for the Nay Sayers to come after you.
If you are referring to my post I did not once say anything about taking a wild XL tang from the ocean and put it in a 40b. I suggested a smaller tang so it does not reach max size cause a tank life average is 3 yrs (if that) and they never ge the same size as the ocean in captivity
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3 years for a tang? If someone is only having their tangs live 3 years, something is very wrong.
So, because the tank may only be up for 3-5 years it makes it okay to put a tang that gets over a foot in a 3 foot long tank? (( using the sohal/65 example you posted above )).
IMO/E, it is best to stock fish that can live their life in the tank that you currently have, and not one that you hope to have in the future --- life can/will get in the way.

