i started a 90 gal f.o.w.l.r. and a disaster has occurred!!!

coral1119

New Member
i took a break from the saltwater hobby, but came across a bargain for a 90 gallon tank w/ a wet/dry inside (reef ready). the previous owner claims he had the tank established for 8 months now. i took the tank home with the sand intact. i placed the rocks back in(aprx 45lbs). i used about 6 gallons of his original tank water. i topped off the rest w/ new water. i didn't touch his bio balls he already had, only added new carbon and ammonia remover media. and new filter floss. i ran the tank for a full day then tested the water. the parameters were good...
ammonia 0ppm
nitrite 0ppm
nitrate 0ppm
ph 8.0
i then placed the 5 damsels, 1 blenny, and 1 peppermint shrimp that the tank came with inside. they seemed just fine. the next day i tested the water again and had the same results. so i made my way to the LFS. i picked up 6 damsels and two moorrish idols (they were eating pellets!!!). i placed them into the tank and all seemed well for the first 2 hours. i took a 2 hour nap...and when i woke up all the fish were either dead, gasping for air at the top, or on the ground motionless.all the fish, even the original ones that had survived earlier.i had to leave for work unfortunately, but the next morning all life had died in my tank. i think the snails are even dead. i took all the dead out. i tested the waters and they came out :
ammonia 0ppm
nitrite .25ppm
nitrate 10
ph 8.0
one thing i forgot to mention. when i picked up the fish at the LFS, i also purchased a 50 micron filter pad from coralife.never used it before. i placed it in the wetdry right after i placed the new fish in. the only explanation i can come up with is the pad is contaminated with something in some way. what else can explain the sudden death of the entire tank? i have had one fish die maybe.....every week or so, but never the entire tank inluding the inverts. as of now im doing a 60% water change, and will test the water again. will probably monitor the water closely for a period of time to make sure its stable before i test them with fish....this time around. any advise or comments would be greatly appreciated.
 

nwdyr

Active Member
Well.....allot here to talk about. I will get the ball rolling with...84 gallons of new water??? seems like a huge amount of new water to me
also added wayy too many fish wayyy to fast! JMO i would do a 30-40% w/c then just leave it alone for awhile. yea 14 fish in a couple days......
 

spanko

Active Member
I gonna guess the original fish may have been okay in the tank if just left as the only occupants for a while. I think the problem came from the additions of 6 more damsels and two moorish idols. This increase in bio load overwhelmed your filtration and probably ammonia posioning killed your fish.
Just my guess let's see what others say.
 

rslinger

Member
The water change was not the problem........ You can change 100 percent of the water with cycled live rock and sand it doesnt matter. The problem is probably to much to fast. a couple fish at a time. once every couple weeks would do a lot better. I won't start in on th idols but
why take the chance with them 90 is pretty small for them.
 

premilove

Active Member
Originally Posted by Rslinger
http:///forum/post/2806003
The water change was not the problem........ You can change 100 percent of the water with cycled live rock and sand it doesnt matter. The problem is probably to much to fast. a couple fish at a time. once every couple weeks would do a lot better. I won't start in on th idols but
why take the chance with them 90 is pretty small for them.
+1
 

hammerhed7

Active Member
I agree with the above, also what type of ammonia remover are you talking about? If it is the white media that resembles carbon, you should not use that in a salt tank it is made for freshwater use only.
 

spiderwoman

Active Member
Also probably your acclimation was not sufficient for the fish.
PS Why would you put Moorish Idols in such a small tank?
 

95harley

Active Member
If you break down a tank and move it and put mostly new water in it it WILL cycle again. Just a fact. Set it up, let it run for several weeks. Add a couple of damsels, let it run for several weeks to a month.
Test, test, test.....
Inverts and especially Idols are sensative to water fluctuations, so things have to be rock solid. Not a newly set-up cycling tank.
The death of one or two of these would have spiked the ammonia and started a chain reaction.
As stated above, Idols don't belong in a 90, but certainly not in ANY newly set-up tank.
Clean it all up and start over. This time slow it down A LOT!
 
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