Jump to content

Recommended Posts

So I have a 20 gallon long that’s been running since November 2020. I originally got a group of 6 celestial Pearl danios that started in my 10 gallon tank that I moved to my 20. I had 4 males and 2 females. I had one successful spawn right before I went out of town so I lost all the fry while I was gone. Since then I’ve added a blue stiphodon goby (which disappeared, might’ve accidentally been taken out with some plant trimmings?) 7 Habrosus corydoras (lost one but I think something was wrong with its mouth, it never seemed to get bigger and was always skinny, and it’s mouth looked weird). Then I added 4 gertrudae rainbow fish (2 males 2 females) and have had 4 different super red bristlenose plecos (1 re homed when I found out my female was really a male, then one of my two remaining males died, so now it’s a new female and the original female that ended up being male). I also have a male apisto hongsloi that I added at some point as well. I randomly lost a male CPD a few months ago, it seemingly overnight had become almost rainbow 🌈 shaped and it’s mouth was moving really rapidly, like it was breathing heavily. No other signs. I tried isolating it and it died. The cory when it died I think it just wasn’t able to eat due to a mouth deformity. The male bristlenose died right after a water change, which I had dechlorinated and was slightly cooler than the water in the tank, so no idea what happened there. This has been over the course of the last few months. About a week and a half ago I added 3 new CPDs that were juveniles that had just recently moved up to the floor (my local fish store does a lot of in store breeding) and today during my water change I found one dead, it had probably died maybe 2 days ago, some decay but not enough where I didn’t know what it was and I’d seen all 3 of the new ones recently. This morning prior to the water change I also noticed 1 of my male gertrudaes was staying towards the top right at the surface, whereas the other three were swimming around the mid and top level like normal. I also noticed another of the male CPDs was doing the same as the one previously did before it died. 

before my water change I tested the water, there was 0 ppl nitrite, 5 ppm nitrate, 300+ on general hardness (according to CoOp test strip) and 40 kh on the CoOp test strip, with a pH of ~7.2. My temp was probably around 79 since my heater was off but it didn’t feel extremely warm. I did my water change, took out about ~25% then dechlorinated with the Fritz that the CoOp sells with the pump head, I did 2 pumps then filled the tank from my tap then added another pump just for good measure. 

a few hours after the water change and the CPD and gertrudae were still acting funny so I put them in a Lee’s container on the tank with an air stone, half a tbs of salt and 10 drops of Prazi pro, and within an hour the CPD died. 

of my original 6 CPDs only 1 female and 2 males are left, and only 2 of the 3 new ones remain. 

Filtration wise I have an aqueon 10 HOB, a medium sized CoOp sponge filter, and I just upgraded my other HOB to the tidal 55, I kept all the old media and added seed. That change was done this past Friday. The flow is as low as it can go but the fish don’t seem to mind, I’ve yet to see anyone struggling in the flow. 

I tested using the API Kh kit snd my Kh was ~4 after the water change (which is what I normally run) and ammonia was .5 (but I’d also Just done a water change) so I threw more seed in.

im really at my wits end as to what is going on, why I keep having random fish deaths when everything else looks healthy. 

my LFS keeps new fish under observation at least a week, treats when necessary, and I keep an eye on the fish for several weeks before I take them home (I work at my LFS). I do weekly water changes, I test my water frequently, but I’m really at my wits end as to what’s going on in my tank.


Below are some pictures of the gertrudae that I’ve isolated, the freshly dead CPD, and then the tank itself and some of the fish in it. Any advice or ideas would be greatly appreciated, my best idea rn is possible gill flukes? Since I see some red in the gills, but I don’t reallly know much about them yet (I’ll talk to our aquatic vet staff at my LFS tho when I work tomorrow).





















  • Sad 1
Link to comment
Share on other sites

Hmm.... (while I’m thinking, is that a batch of subwassertang you’re growing in the hang-on / breeder box?) ....

T he 6th photo down looks like something is going on with the hills.

To do a general troubleshoot, I’d check through a prepared list:

(1) Water parameters in tank - pH, Ammonia, Nitrite, Nitrate; temperature

(2) Water parameters of your source / tap water

(3) Try a different dechlorinator just to eliminate that possibility of problem.

(4) Check for stray current in the tank.

(5) Ensure enough air ... add a stone

(6) Hit the tank with med trio, or move fish to a quarantine tank and treat them there.

—something about the ammonia is concerning. Is it usually up? Or was that due to dead fish decay?—

Edited by Fish Folk
  • Like 1
Link to comment
Share on other sites

I think the ammonia is from the water change, I remember hearing something recently about the chlorine being converted to ammonia when dechlorinated which is then converted by your bacteria, it’s been like that before right after a water change and goes down within a few hours. I have maracyn but I don’t have para cleanse. I Do have Prazi pro but I’m unsure if it’s plant safe, and I just got crypt pink flamingo 😬

the subwassertang was grown in the main tank then moved to the breeder box because I was trying to get the CPDs and gertrudaes to spawn in there 😅

I don’t have any meters or anything that could check for current, but when my hands were in there I didn’t feel anything. 

I’ll test everything again tomorrow and probably order some para cleanse. I think I might have general cure, if I do I’ll throw some of that in for good measure.

air wise, I have a sponge filter that’s cranking a good amount in the tank and a lot of water movement on the surface so I think I’m good there.

Thanks for the detailed response 

Link to comment
Share on other sites

I’ve decided to treat with general cure and Prazi pro to the main tank. 2 packets of general cure and 1 teaspoon of Prazi. I’m thinking it’s gill flukes since I’ve noticed the wasting and the gills have looked bright red on the gertrudae rainbows, and even more so on the male that’s not looking too great. I’ve also noticed them seeming to be out of breath, even though there’s no ammonia and great oxygenation in the tank.

Link to comment
Share on other sites

@mountaintoppufferkeeper  Here is my thread on me currently dosing general cure and Prazi pro. I’ve got the test results from the day before treatment and day 1, Altho I’m unsure if I tested or medicated first, I’ll test again and post results tomorrow/later today (it’s 5am for me rn lol). I’m very intrigued to see if those meds affected my water chemistry at all like yours did with the para cleanse.

  • Like 1
Link to comment
Share on other sites

10 hours ago, Steph’s Fish and Plants said:

@mountaintoppufferkeeper  Here is my thread on me currently dosing general cure and Prazi pro. I’ve got the test results from the day before treatment and day 1, Altho I’m unsure if I tested or medicated first, I’ll test again and post results tomorrow/later today (it’s 5am for me rn lol). I’m very intrigued to see if those meds affected my water chemistry at all like yours did with the para cleanse.

Very interesting. I  look forward to seeing the update. More of an observation than anything. I thought it was enough change in my system to share. 

  • Like 1
Link to comment
Share on other sites

Tested the tank just now, waiting for the results. I am expecting a slight increase in pH and alk because I run crushed coral in my filter (might need to swap for new soon tho) 


Ok so here it is. After following the instructions to the Tee, I see no change in my parameters except maybe lower nitrate (makes sense, I have live plants). Today is day 2 of general cure and Prazi being in the water, so I think if either of those meds are gonna change chemistry it would be extremely slowly over time, and you’d probably have finished treating and pulled the meds out long before they had any effect.

Link to comment
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now

  • Create New...