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Discussion Starter · #1 · (Edited)
Hello.
We are hoping to get some insight into our tank and also save the rest of our fish.

we got our tank in January and had it fully cycled then we upgraded to a bigger tank at the beginning of the month and we used our cycled filter for the new tank. We waited 2 days and moved the fish. We then waited a week before getting more.

All our fish were happy and healthy. We then added 6 tetras to our already 6 and 2 yoyo loaches because we have some pest snails. The new tetras were slightly small than our original ones so we could tell which ones died. 5 out 6 of the new ones and 2 out of 6 of our original ones died within 48 hours. One loach also died the same day we got him but the other one seems perfectly fine. Our betta and corys are happy.

We now have a betta, 5 tetras, 2 corydoras and 1 yoyo loach remaining. How can we make sure they don’t die as well? Please help.

Our water parameters
NO3 - 10-25mg/l
NO2 - 0mg/l
GH - 6-10d
KH - 3-6d
pH - 7.2
Cl2 - less than 0.4mg/l
Temp - 27 degrees Celsius
Tank - 110l

we have one smaller filter (cycled from smaller tank) and one big filter that is busy cycling.

Water Plant Blue Underwater Fish supply


Water Plant Vertebrate Blue Fish supply
 

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10g: 8 young golden Dalmatian mollies 1 neon tetra 2 nerite snails 10g: 2 nerites, soon molies fr t1
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You say the tank only ran for 48 hrs before the fish went in?
 

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10g: 8 young golden Dalmatian mollies 1 neon tetra 2 nerite snails 10g: 2 nerites, soon molies fr t1
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Ok. But how long had the tank been sitting out? I’m guessing either the new fish you bought just weren’t healthy, and then they rubbed of on a couple of others or your tank wasn’t properly cycled.
 

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Discussion Starter · #5 ·
Ok. But how long had the tank been sitting out? I’m guessing either the new fish you bought just weren’t healthy, and then they rubbed of on a couple of others or your tank wasn’t properly cycled.
Ok thank you. I believe the tank was out for less than a week as the gravel was still damp. Do you perhaps have any advice or signs to look out for to make sure the rest will be ok in the case that the others was unhealthy?
 

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Yes. But it was a second hand tank. The tank was only empty for a few days at the previous owners and we used our fully cycled filter in the new tank.
Ok thank you. I believe the tank was out for less than a week as the gravel was still damp. Do you perhaps have any advice or signs to look out for to make sure the rest will be ok in the case that the others was unhealthy?
Sounds like you're having ammonia spikes, when's the last time you tested for just ammonia? It's either that or the fish IMO. Where did you get the fish from? You shouldn't just add fish to your tank without taking precautions like quarantining and medicating. BTW two days isn't long enough to have a tank running to add that many fish at once. Even if you have a cycled filter running on it, your tank still needs to colonize beneficial bacteria in and on the substrate as well. It also colonizes on all the surfaces too. Test your NH3 and get back to us.
 
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