Dinner plate tangs

[Lance]

Interesting thread.
Whenever I buy a fish I record the date purchased and the length of the fish. So I can give you a pretty good idea; at least with these three species. I also feed quite heavily and they are all fat.
Sailfin Tang: 4" to 6" in 30 months
Kole Tang: 4" to 5.5" in 19 months
Chocolate Tang: 3.5" to 4.5" in 11 months

[marie]

I have a yellow tang that I've had for 5.5 yrs and is still the same size as when I bought him.....my achilles on the other hand was 3" 4.5 yrs ago and is now approx 9" (90% of his growth happened in the first 2 yrs)

[Delphinus]

Someone linked to an article (well, more of a blog I think) a couple weeks ago where he talked of carbon use and the buildup of generic "organics" and his theory was that it was the buildup of organics over time, that which can't be easily skimmed out, that contributed to the max size of fish, smaller than that of their wild counterparts .. more so than tank size and the old addage that they grow to the tank and stop. I don't think he cited any research so who knows how close to the mark that was but nevertheless it does seem an interesting (and plausible) theory.

My desjardini sailfin tang is 9 years old and I'm not sure that he has stopped growing but I don't have a good way to quantify that. He's certainly 3 times the length that he was in 2001. That said he's considerably smaller than those I have seen in public aquariums.

Heard lots of theories about this sort of thing, ranging from "they grow to the size of the aquarium" to "they never stop growing" to "they don't really stop growing but they develop skeletal issues and eventually perish prematurely because they CAN'T grow properly" and now this last one (that was clearly in favour of carbon usage to combat the buildup of "organics") in that it has nothing to do with water volume but rather the chemical soups that tanks tend to become over time.

[Lance]

Did he say the carbon as well as the organics led to diminished size? That's interesting as I've heard that carbon may be a link to HLLE in Tangs and Angels.

[Delphinus]

No I think he was suggesting that the organics were the cause and that carbon was really the only way to mitigate the buildup of organics. Now that you mention it I remember hearing that there was thought to be a link between HLLE and carbon but I wonder, now that we have access to higher quality carbons, could that have been more an artifact of lesser grade carbons with more metals content? I wonder if anyone's gone back and taken another look at that.

[Delphinus]

Sorry forgot the link - here it is - http://joejaworski.wordpress.com/200...k-need-carbon/

[Zoaelite]

Had to sell a few of these tangs as they out grew the tank (Much faster than anticipated but it varies between genus). My Acanthurus and Naso genus tangs grow really fast while my Zebrasoma and Ctenochaetus grew muuuch slower.

Vlamingi- 3-6.5" in 8 months
Yellowfin- 4-7" in 5 months
Orange Socket tang- 2-7" in 18 months
Yellow- 3-5" in 13 months
Purple- 6.5-7" in 3 months
Chocolate Mimic- 3-4" in 13 months
Orange Chocolate Mimic- 5-5.5" in 6 months
2 Spot Bristtletooth- 3-4" in 13 months

And there all fat little piggies.