Go Fallow or Not?

Nolan Cash

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Hey everyone.. so i’m fairly new to the hobby. I have a 40 gallon AIO that is about 1.5 months old. Started with dry rock and used some nitrifying bacteria and 2 clowns to help cycle the tank. Everything did extremely well, water changes every week. Got a juvenile yellow tang about 2 weeks later (got talked into it by my LFS, i know i know i’ve done more research since).

Tanks had 20 hermits, 10 snails, cleaner shrimp, pistol/goby pair, 2 clowns, yellow tang

Parameters (api testing kit)

salinity 1.026
temp 77
ammonia, nitrate, nitrite 0
ph 7.4

tank was great when I left for a week to go council a church camp. came back to some tiny white spots on yellow tang, i assumed it was ich but i didn’t have a QT tank at the time. So i watched the fish like a hawk.. spots went away after 2 days and everyone was healthy and eating.

decided to do some maintenance by stirring up sand bed to move waste and diatoms. a water change hadn’t taken place in 2.5 weeks bc of the vacation, so that was going to be done the next day.

i wake up the next day to some pretty lethargic fish but i didn’t think anything of it since lights were still off. came home 8hrs later to a dead yellow tang, was hard to see if he had any white spots as he had sand on him too from being in the sand bed. clowns were struggling.. just laying in sand bed gasping for air.

I had setup at QT the day before so i moved the clowns, goby and his shrimp friend (just to keep them together) into the QT. Clown have almost fully recovered, they are eating and swimming about 75% of what they used to.

All this to say, what went wrong? Should i go FALLOW? How to treat QT tank?
 
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Mr. Mojo Rising

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Sorry but cycling with fish and putting tangs into that tank is an invitation for disease to join your tank. The tang should be in a 100+ gallon tank, 40 is too small and stressful to a tang. Cycling with fish hurts and stresses them.

Its very important to stock slowly and stock according to the tank size, or else you risk disease, aggression, or jumping fish.

How is the water oxygenated? Can we see a tank pic?
 
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Nolan Cash

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Sorry but cycling with fish and putting tangs into that tank is an invitation for disease to join your tank. The tang should be in a 100+ gallon tank, 40 is too small and stressful to a tang. Cycling with fish hurts and stresses them.

Its very important to stock slowly and stock according to the tank size, or else you risk disease, aggression, or jumping fish.

How is the water oxygenated? Can we see a tank pic?
yes.. i learned that after the fact, totally my fault, i know. i have a lot of surface movement as well.
 

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threebuoys

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How did you manage your QT when you added the clownfish? What did you diagnose to be the problem and why? What do you attribute their "recovery" to?
 
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Nolan Cash

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How did you manage your QT when you added the clownfish? What did you diagnose to be the problem and why? What do you attribute their "recovery" to?
thats why i posted here.. i have no idea what the problem was, i didn’t treat with anything, which makes me think it was a parameter problem and not a parasite, but that why i asked for help here.
 

threebuoys

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So, if you didn't do anything special while in QT, and if you were not able to definitively identify the cause, going fallow would have no benefit at this point. Should ich or velvet subsequently appear, you will need to treat appropriately and also allow the tank to go fallow.
 

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