Lemon tetra death

Yes, Sorry and GOOD LUCK.

PS--Test kits needed--Ammonia, Nitrite, PH, and Nitrate
IMO--The order of importance.
 
I just had a similar thing happen in my tank. Its a 180 litre tank. I had changed the water, cleaned the sponge filter (not in tap water just in a bucket with tank water) and added some plants later that day. Later that night, the lemon tetras started to swim funny and die, one at a time. By the morning i had 4 dead lemon tetras. All the other fish seem ok (neons, glowlights, goramis, cory's, bristlenose, plattys). A mini cycle you think? are lemon tetras more delicate than the other fish perhaps?

Also, the tetras have been in there for a year, no new fish have been added for a while.
 
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Mini-Cycle in 50G after adding 10 new tetras? If this tank were well matured tank, I stongly doubt that!
However, I will suspect your tank water condition at the time of introducing new Lemon's even though you have/had same fish in same condition for a while. Because you have same fish living in it doesnt necessary mean that water is in optimal/ideal condition new incoming fish.
Stress out new fish, due to exposure to unideal water, can promote population explosion of pathogens that maybe already present in the tank, yielding many complications/deaths in very short time.
FIsh that are already accustomed to your water condition are probably healthy enough to withstand any invaders but weakend/stress fish( new fish) may not have such high immune ability.
And as new fish become infectious, they themselves become pathogen producers and carriers, spreading more pathogens Yielding higher mortality of entire populations, sometimes in matter of hours.

No different from pathogens which affect any other living organisms, including us.
 
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