Losing fish - Update another dead today

[BENT17]

Im loosing fish!

I got two new amanos and I found one.dead and 4 baby srimps which I cant find anymore. 2 weeks ago I had 15 cardinals and now just 11. My GH 5 KH4 Ph 7 and rest all good.

What can it be as I am completely lost here

 

[BENT17]

If poisoning wouldnt all the fish get sick? Tetras and shrimps are fine
Apart from white on the sides it has like blood marks?
Spoke to my fish shop and they told me its not sickness but co2 poising. They told me to reduce the co2 to increase ph. With co2 ph is 6.6 and when off it jumps to 7.2. Thats a 0.6 jump which is not healthy and stresses the fish apparently. I was told to leave lights off for a day and turn off co2 for a day also then try keep ph with co2 on to around 7.0.. what do you think?

 

[AlyeskaGirl]

I have read through this a few times. So sorry for your fish losses.

When injecting co2 it is completely normal to have pH drop. The most important is that the GH does not swing.

When lights are off plants take in O2 and release CO2. Make sure you have good surface movement when lights are off. Your wave maker should give good rolling ripples but not breaking the surface tension. Even adding an airstone on a timer after lights off.

 

[Fisch]

I am sorry for your fish just dying off, I hope you will find the solution soon. You mentioned your tank is heavily planted, though the pictures are not really supporting that statement. What about switching off the CO2 for a couple of weeks and see if your tank stabilizes. Which plants do you have in the tank that absolutely require CO2?

 

[NotSoAggressiveAquatics]

So tested ph so here it goes

5pm: 6.6
9pm: 6.6
12am: 7.0
7am 7.2

TDS throughout was180
And no dead fish!

This is most likely your issue. Your ph is changing a lot in such a little amount of time and fish are sensitive to ph changes. What are you adding that changing the ph

 

[BENT17]

This is most likely your issue. Your ph is changing a lot in such a little amount of time and fish are sensitive to ph changes. What are you adding that changing the ph

The ph swing is coming from the co2 going on. I have a substrate which acts as a buffer and since its RO water I add minerals which increase GH and KH. I also add excel, flurish, potassium, nitrogen througout the week and iron with every water change. Should I go ahead and keep lights off and co2 too? Then reduce co2 to be at a constant 7.2-7.4? I think the drop is killing my fish.. maybe doing that would save them

 

[BENT17]

This morning I found 2 other fish dead (tetra and rummy nose) with no signs whatsoever.. in the evening after I did a water change I saw a rummy nose with white lips looking lost so I decided to get rid of it. I also noticed some kind of fungus? on the side of a rasboras. What do you think?

 

[notamermaid]

Stop using Excel, I don't think you need it with CO2 & it may be causing your problems.

 

[BENT17]

Very interesting read.. I dose Excel 5ml one day yee and one day no.. worried algae will appear.. also what do you think about these two..

 

[notamermaid]

Look up Lymphocystis; that & the white head can both be signs of stress.
Can you tell if it's fuzzy on the rasbora? If so it's probably columnaris, as fungus is more common in dirty tanks, but it could be either on stressed fish.
See if you can get reminralized RO water from a fish store & use that for a couple weeks to see if your water is the problem.
I like the idea of reducing the CO2 for a while.

 

[Pfrozen]

Well man after DMing for awhile and this whole issue being a total mystery I think we've identified the silent killer. Looks like you might have some columnaris or something nasty buddy. With all the deaths you've had over the past while I would go the medication route at this point