Tangs Keep Dying

First of all, THANKS EVERYONE for all your help and insite. I have learned a ton concerning my Tang issue.
To address a few questions....
#1. Handeling by shipping company has been VERY BAD, mainly the driver! and Yes I believe that the fish are so stressed from it that any chance they would have had to survive is very minimal.
#2. Oxygen level... not sure how to measure this. I have a Mag Drive submersible pump and a Koralia 1400 circulation pump. I have been thinking about adding another Koralia either same size or slightly smaller.
#3. The order the Tangs were added to tank....
Addition 1: Powder Blue medium/large from LFS
Addition 2: Replacement Powder Blue small/meduim from LFS
Addition 3: Kole Eye medium, Blue Hippo small, Powder Blue medium, Kole Eye lived for about 3 months
Addition 4: Kole Eye medium/large, Powder Blue small/medium, Naso small
Addition 5: Kole Eye medium, Blonde Naso small/medium
Addition 6: Blue Hippo medium and Powder Brown small medium
I added Tangs at once, as directed, since I wanted multiple in my tank.

 

Water Temp is 75 degrees
Feed seaweed 3 times/ week

 

Just because a store doesnt mention it, it doesnt mean you shouldnt do it. The information is there to back it up.

the reason why im so insistent on acclimation is because it is a real crucial part to adding new fish to the tank when they are not bought locally. You can permanently damage a fish if not done properly and can definitely explain his premature deaths..

My next guess is definitely the handling of the UPS truck and the fact that we are in mid summer. If you ask me, i would wait until the weather is better and try again *this time using all the knowledge you have now*

the other good explanation i saw was oxygen deficiency.. Make sure your water has a good amount of flow and a good amount of space for gas exchange. (however i dont see why his other fish wouldnt be dying as well if this was the problem).

I truly believe that your tangs dying so soon on you has nothing to do with food. I rarely feed my 3 tangs nori, and you dont see them dying on the first week. I do supplement with pellets but again, your deaths are way too soon for it to be food.

 

I don't think oxygen level would be it of the op is running a Skimmer. Even if it is a crappy Skimmer is would still be adding morthen enough oxygen. I would definitely suspect stress from handling from shipping handler. How close are you to your lfs? Would they be handled by the same driver most likely from the same distro center at least if by the same carrier. Maybe you can try specifying a different carrier...like if live aquaria and lfs use ups try special ordering fedex. I mean it could be worth a try

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i agree with elwesh. what is your salinity vs the water they came with? its ok to go from high to low but vice versa is a no go. with your skimmer and if youre pointing your ph to the top of tank, you should get enough oxygenation. handling could be another reason though they seem to live for a while. cyanide maybe, but with that many tangs i doubt it. try to feed a lot of nori too depending on what you feed them primarily. good luck.

 

I havn't seen it yet but what are all of your water parameters?

Also, I would not be adding a naso or a hippo to a 90g, they get far too big. The powder blue is about as large as I would go, the kole is a better choice. But I don't think this is the issue with them not surviving.