mistake cost life of tang, how to prevent in future

Holacanthus

New member
2 colors only
1000 = .60 each
2500 = .55 each
5000 = .50 each

2 colors with underbase
1000 = .78
2500 = .65
5000 = .55


Recently I bought a queen angel, mid size around 4" had completed the color change. It has been in QT for several weeks, eating well, seems to be in very good health. In my main tank I had a juvie Naso tang, Kole tang and some smaller fish, and probably a 5" chocolate tang. My main tank is a 225 gallon 84" long tank.
Ive had these fish for over 6 months and decided to add a queen to the mix. The chocolate tang has been aggressive to the Kole tang, and occasionally chases the clown fish but doesn't really pick on anything else.
So yesterday I made the decision to put the Queen in the main tank. The queen was maybe an inch smaller in length than the chocolate tang. I slow acclimated the QT tank with main display water, while replenishing the main tank with new. Once I had done this process for almost two hours I decided to transfer the queen.
To make the transfer easier in catching i decided to drain the 30g QT tank about half way down, I then caught the queen and added to DT. Queen went to the right corner and just hung out for a bit, i decided to feed the rest of the fish on the left hand of tank to distract them. Once they finished eating the Chocolate tang noticed the queen. It went right to it and started twitching, kind of like flexing it s muscles if i had to describe it. I kept an eye on them for about a half hour and he kept following it around wherever it went. During this time they went behind the rocks on several occasions where i couldn't see what was happening .
I didn't see any real issues so i left observation of the tank for around a half hour, when i came back there was sand dust in the water, all the fish were hiding and the queen was swimming back and forth with the chocolate in pursuit. he would chase the queen but not much more. Things seemed to go downhill from this point though, eventually he went from chasing it to nipping at it and trying to tail stab. I let this go on for a little while as the queen would lose him for 4-5 minutes and he would calm down. Finally he got to where he was chasing it into a corner and then really trying to inflict damage aggressively trying to bite it and hitting it repeatedly with its tail spines.

I decided at this point to pull the chocolate and place it in the QT. I had read with aggressive fish it is sometimes best to remove them, rearrange the tank and then place back in the DT once the new fish has been introduced. So i placed a white plexiglass divider in the center of the tank and got the net.
I will admit that my stress level was pretty high at this point. The thought of me introducing the queen angel and watching it get killed was like a punch to the gut, so i wasn't thinking as clearly as i maybe should have been. My only thought was getting the chocolate out to save the Queen angel. We were able to net the chocolate in less than 5 minutes after adding the divider. and then placed straight into the QT tank.
Once this one complete i took out the divider and put in the pieces of rock i needed to take out to remove him. At this point everything seemed to settle down so i decided to take a break and have supper. I came back to the tanks in about 20 minutes only to find the 7" of water in the QT to be very cloudy, the chocolate was in a state of panic, swimming in circles, bumping into glass and breathing heavy. As i had drained the QT halfway i didn't have immediate water made up to change. So i grabbed one of the large fish bags i had and filed it with main tank water and put the chocolate in it. My plan was to run to the LFS real quick and come back and start making water. I figured if a fish can travel across the country in a bag of water surely it can handle one hour in a bag while i made more new water.

By the time i got back from the LFS the chocolate tang was upside down in the bag. I immdeitaly shut off the sump pumps to DT and just took out 30 gallons to fill the QT. I took the chocolate out of the bag but at this point it was too late and he was deceased within 30 minutes.

I am pretty shook up over this. I hadn't had the chocolate too long, he was the newest and was sort of an impulse buy. But I do feel a strong sense of responsibility for ensuring the fish i purchase do not die by my negligence or mistakes, and i killed a fish last night that i know somehow i could have prevented.
What does anyone here see that i did wrong and what steps could i have taken to ensure this didn't happen/won't happen again?
 
Was the bag sealed? When they ship overnight they fill with pure O2.

Sent from my SAMSUNG-SM-G935A using Tapatalk
 
Was the bag sealed? When they ship overnight they fill with pure O2.

Sent from my SAMSUNG-SM-G935A using Tapatalk

Yes I had mentioned its slight aggressiveness to a lfs and they had agreed to take it on trade a few weeks back. But I decided to keep it as it had temporarily calmed down. So when I bagged it I had intention of taking it straight to the lfs. But when I called they went back on their offer. I didn't think to undo the rubber band on the bag when I left to get salt. Could that have caused it? I put quite a bit of water in the bag
 
Yes I had mentioned its slight aggressiveness to a lfs and they had agreed to take it on trade a few weeks back. But I decided to keep it as it had temporarily calmed down. So when I bagged it I had intention of taking it straight to the lfs. But when I called they went back on their offer. I didn't think to undo the rubber band on the bag when I left to get salt. Could that have caused it? I put quite a bit of water in the bag
Sorry I was thinking it had been in the bag longer. I don't see any reason why it would have passed in the hour you had in the bag. I know ammonia levels can rise in the bag quickly so that coupled with the stress would be my only guess.

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