Rainbowfish dying unknown reason

[Rolance]

I cant figure out why my rainbowfish are dying. I just lost two of my 3 rainbowfish within 3 or 4 days of each other. My tank is a 55 gallon community with 12 glofish, 3 otos, 2 denison barbs, and a bushy nose pleco. I have the topfin 75 filter it came with and two Aquaclear 30's and the heater it came with. Everthing is going great, i have lots of malaysian driftwood and a sand substrate. I checked my parameters and everything is spot on.

So a few days ago my boesemani rainbowfish was swimming all crazy and he would go upside down then swim crooked then get stuck between some wood or on the bottom so i went ahead and got him out. Since then i noticed one of my two australians was losing color and not eating and just last night i noticed he was swimming all crazy to and got stuck on the bottom. I had to take him out. My last and biggest australian rainbow seems to be doing fine. He was kind of starting to be a slight bully towards the other two but i dont think enough to kill them. All other fish are fine as of now. Was is killing my fish?

 

[Delapool]

Can you list water parameters for tests you have? Also had there been any changes in the tank when it started - even a temp change or pwc?

Any marks on the fish at all?


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[Rolance]

There were no changes, i hadnt done anything but top it off with water in two weeks. Sometimes i do weekly water change and sometimes i end up skipping a week but other than that no changes.

I am going to test my parameters tomorrow and post them.

There wasnt really any marks on them. Just one day i noticed they weren't eating and lost color then they were swimming all messed up. One had a bent looking body like it was cramped up.

I have one rainbowfish left and hes doing just fine. Maybe this one was bullying the others since I only had three idk..

 

[Delapool]

Odd one. My thought would be either water conditions or a bacterial infection of some kind. Definitely worth checking water readings for sure. Just in case I would also increase the pwc's for a bit.


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[Rolance]

So, two days ago which was right after my second rainbowfish died I decided to do a huge water change and filter cleaning which i shouldnt have done. I took out way too much water and moved all my driftwood disturbing tons of crap. I also replaced one of my filters media and the other two i just squeezed out in tank water. In doing this massive cleaning i managed to kill my two denison barbs. I learned afterwards that they are very sensitive to water cleanliness and need high oxygen levels and sensitive to temperature.

Now i just checked my parameters and Ammo is 0ppm, Nitrite is 0ppm, and Nitrate is 0 ppm. That is very low Nitrate for my tank, i really hope i didnt restart the cycle. pH is at the normal 7.5 for my tank.

 

[Delapool]

So, two days ago which was right after my second rainbowfish died I decided to do a huge water change and filter cleaning which i shouldnt have done. I took out way too much water and moved all my driftwood disturbing tons of crap. I also replaced one of my filters media and the other two i just squeezed out in tank water. In doing this massive cleaning i managed to kill my two denison barbs. I learned afterwards that they are very sensitive to water cleanliness and need high oxygen levels and sensitive to temperature.



Now i just checked my parameters and Ammo is 0ppm, Nitrite is 0ppm, and Nitrate is 0 ppm. That is very low Nitrate for my tank, i really hope i didnt restart the cycle. pH is at the normal 7.5 for my tank.

Sad news. Hopefully the tank settles down. I've had the tank temp jump several degrees C in the first heat wave of the year and that set off problems. My suspicion is that if fish are under a bit of stress then another change just gets too much. If everything is good then I've had the water temp drop by 20% in a pwc and no problems at all.


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