What kills fish but not inverts within 24hrs?

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For full details on the setup of my tank ----> First reef tank of a very paranoid person - Marine Aquariums South Africa

After having shrimp, corals, snails and hermits in the tank for a week I decided it was time for my first fish. I bought two firefish last week friday, a red and a purple, sadly the bug bit me badly, bought a purple dottyback the sunday. I'm goint to be honest I didn't listen to the people smarter than me so I bought two true percs on monday.

Drip aclimated all the fish, few sparringly, everybody seemed to be doing great.

Thinking I was doing a good thing on tuesday evening I fed them thawed food with Aquazole, like I would with new freshwater or brackishfish. (Very stupid I know that now). Everybody loved the food, afterwards the clowns were chasing the dottyback, the firefish were hovering around, all normal.

Next morning before work I went to switch on the lights and found my hermit munching on the one clownfish. All my fish were dead :m24: :m24: :m24:
Yet my all my shrimps were happy, even the cleaner with the massive parasite who molted two days ago was looking chill!

Took water to be tested, pH was a bit low at 8, Ammonia was less than 0.25, otherwise all paramaters were normal. I have been dosing special blend every 3rd day.

Now please tell me. How did I kill my fish without killing my inverts? Did I make the most noobish mistake by adding too many fish within too short a period? What happened? And how can I prevent it from happening again?

Thanks everyone.
 

dallasg

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Hi,

looking at that i would think ammonia spike from adding to many fish at once.
 

dallasg

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to prevent this here is what i do

when i add a new fish or fishes, i test ammonia the next day, if i dont get a 0 reading i know i have to increase my biological filtration and dose extra bacteria for a few days to allow the system to adjust and catch up to the new bio-load
 
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simple question maybe. could the ammonia not have spiked(raised) due to the fish dying in the night and water only being tested some time later?
 

Perky Pets

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strangely not , ive recently had shrimps go through the curing process of live rock ...
 

tekkengal

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strangely not , ive recently had shrimps go through the curing process of live rock ...
lol, they are weak with salinity changes but can survive a cycling process :m12:
Thanks for the info!
 
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Certain shrimp are indestructible. I reckon coral bandits could probably live in the toilet if they needed to.
But short answer to many fish to soon. Patience is the name of the game.
 
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An interesting notion I've come across is perhaps something happened to the O2? And that is why the inverts were not affected because they don't use a lot of oxygen.
 

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