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I’m with the lock man on this. The OP needs to ensure that ammonia and nitrite is at 0 ppm at all times. If it is elevated you need to remove the fish and do a 100% water change. As ammonia and nitrite cause gill irritation this would explain the heavy breathing of the male fish. My guess is...

I don’t know what the manufacturer is meaning then since they proclaim the exact opposite. I’m guessing it is a money-generating ploy for them. Update: The discus is back to fully eating formulated food and is actually displaying pairing behaviour with a male discus. Earlier in the year she had...

It sounds a lot like you treated an ammonia problem as though it was body flukes with fluke-solve. High nitrates, unless we are talking 60+ ppm in a sensitive species tank, do not cause problems in fish. But if you are concerned about nitrates the best solution is to remove them with a water...

I think the Purigen could well be your problem since this is described as a product that effectively replaces the natural processes of regular filter media to remove ammonia, nitrite and nitrate. The product appears to be rechargeable by applying bleach. If you somehow have not removed all that...

I have used Sterazin and can attest that if you use it to treat body and gill flukes you usually require 2-rounds of treatment for it to be effective. However, I would never go against the official dosing instructions given that its ingredients are carcinogenic. I have only ever double-dosed it...

Yes I’m adding dissolved co2 from a co2 diffuser to lower the pH for the purpose of growing plants. The tap water pH is around 7.5 while the tank pH is 6.0 to 6.5. I did a large 80% water change yesterday before the co2 diffuser came on so the pH of the tank water and tap were more similar...

Personally yes i would. Do a 50% water change and get and use Myxazin. It’s a very effective treatment for all manner of bacterial infections. Ive used it to treat internal bacterial infections, cloudy eye and body and fin rot effectively. You dose it daily for 5 days according to the...

A cloudy eye is typical of a bacterial infection and such an infection can be caused if it has physically bumped its eye or the waste in the aquarium and filter is high. If I were you I would clean your filter media in dechlorinated aquarium water; try to dunk the media in tank water to remove...

Is the fish still eating? If she is I would just watch the fish closely for any redness developing. If she stops eating or the ailment gets worse I would treat the aquarium with an anti-bacterial treatment. I have kept GBR's for 10 years I can attest that if you do large water changes with...

I have added Metronidazole to the aquarium. The fish is still eating bloodworms and as such is not and probably will not lose any weight. When I fed it yesterday it eat around 20 bloodworms. It also eat 2 Tetra Crisps; it spat about a tenth of them out. I have noticed that the Bolivian Ram that...

Having read the link you gave I can see the most likely issue is an internal worm since the fish is eating bloodworms and not losing weight. This is by no means an identification; how do you propose I positively identify the cause? I don't know what I'm looking for under a microscope for...

For approximately 3 weeks one of my smaller female Discus has become pale, has stopped eating formulated crisp food (it will still consume blood worm directly from a tweezer but will not seek out food), keeps separating itself from the rest and approx. 2 weeks ago it was defecating white faeces...

The issue, whatever it was, seems to have cleared up of its own accord.

I am looking for disease identification to be honest. I don't think nitrate is a problem in the slightest. Nitrate is added purposefully each week as this is a planted aquarium. This has been the case for the last 12 years. I could go on and on about how my cichlids and koi have bred in water...

So what is the problem with the fish please? I can confirm the fish have been healthy in the presence of 20-50 ppm of nitrate over the last 5 years.

Hi Colin, It is an aquarium with no substrate and the filter was cleaned 4 days ago. Water quality is perfect as mentioned in the original post.

I have recently noticed that white patches are appearing on 2 of my four Discus. Any help with identifying the disease that they have would be appreciated. Water quality is at 0 ppm for Ammonia and Nitrite and 20 ppm for Nitrate. pH is 6.5 and water temperature is 29 degrees C.

It is difficult to diagnose this as the image isn't that clear however I would put my money on it being a bacterial infection of the head. I would recommend that you up your water changes to keep the environment clean and to switch from anti-biotics to the use of aquarium salt as this will be...

I may be wrong but the dorsal fin looks slightly frayed and together with the white lump I would say it has some sort of fungal infection. It appears to have a slightly pale complexion too. I would recommend that you consider using an anti-fungal treatment and ensure that it consumes more food...

Corydoras are very susceptible to bacterial infections, particularly pop-eye and fin rot. I would hazard a guess that one of your Cory's readily developed a bacterial infection from eating remnants of old food on the substrate and when it became deceased the other Cory's would have nibbled at...

You could try the Seachem ammonia sensor. They are pretty accurate and last for a period of 1 year.

One of my four Discus is permanently sat at the bottom of the aquarium with slightly faster gill/mouth movements than the rest and appears to have an opaque colour to its entire body. Fins are moving slowly and will sometimes close them against its body for extended periods. It is responsive to...

I have just treated the tank with Kusuri Wormer Plus on the basis that I cannot find any source, whether from the internet or in any books, to suggest that bacterial infections cause fish to hang at the surface gulping air in. I just hope I've made the correct treatment decision for the sake of...

I thought I would post an update to this thread because the issue is still persisting. Although no more Corydoras have died, two of my albino Corydoras Aeneus are surfacing repeatedly. They are spending about 90% of the time taking in air from the surface. All the colour has drained from them...

Well the Cory's I had in a previous aquarium consumed on a deceased fish and then developed pop-eye. This is what happened; I'm sorry if you disagree with these course of events. On the topic of substrate, this isn't necessary. I have a pond with no substrate and the fish are happy (and have...

Well with Cory's i've been told that they don't fair too well with course substrate, which I don't have or use. Glass doesn't generate much friction so I don't see it being the cause of barbel loss, especially since only 3 of the 8 Corydoras have receding barbels. The 3 corydoras fish with the...

If such hard water species are present in abundance I would apply my original advice and switch to c02 injection so they uptake more carbonic acid as opposed to the bicarbonates from the KH. As for carbonic acid having a reducing effect on KH, I'm not so sure about that. From experience, a KH...

Hi Byron, The other fish include 2x Discus, 2x GBR's and 2x Ottocinclus. The GH value is 6dH from the tap and the Nitrate level, in the aquarium, is 20 ppm. Temperature is 28 degrees (has been 28 degrees C for 7 years and normally causes no issue for Cory's) and it is a bare-bottom aquarium...

Algae and higher plants are able to utilize carbonate hardness content for growth I believe. So to stop them from doing this at an inappropriate rate you should consider adding c02 injection or lowering your aquarium light level. Doing either or both of these things will slow down the rate at...

In the past 2 months all of my Corydoras Aeneus have been showing some worrying symptoms. Some of them have receding tail fins or frayed tail fins and one or two keep surfacing for gaseous oxygen as though their gills are incapable of taking up dissolved oxygen in the water. These symptoms are...

My solution to lowering pH is to get a co2 diffuser for the tank and run it 24/7. The diffused co2 will become carbonic acid in the water and will gradually lower your pH level. If your pH is 7.4 or below you don't need to be lowering it any further as the fish you have can acclimatise to such a...

    Evidence please? Nitrate is a fertiliser, not a toxin. Nitrate levels exceeding 70 ppm are fine and don't cause issues (from practical experience).

   In 48 hours it can be eaten beyond recognition? There are only 2mm snails in there with 2 other Corydoras. Its basically a quarantine tank which is barely stocked. 

You need to look for the leaf turning yellow and then prune it. The leaf will turn orangey/brown afterwards and will have a mushy texture so be sure to always prune before this happens.

I have a planted Discus aquarium too and I keep Corydoras since they will often, on top of having their own catfish food, eat the remnants of food that the Discus don't manage to consume. This ensures that bacteria will not form on the substrate. It will only be a fungal infection if there is a...

I recently treated one of my Corydoras for the Pop-eye condition which it acquired after eating the flesh of a deceased Black Neon Tetra. I decided to turn the fish tank lights off for 48 hours to allow it to rest and recover.   On turning the fish tank lights back on I cannot find this fish. I...

Never personally used this brand of flake. Always considered it to be mediocre brand due to their obsession with using flake which leeches all of the nutrition out into the water. I will be sure to pass on the recall notice where appropriate.

    So sorry for your loss. Be sure to do a thorough vacuum of the substrate to remove any rotten pieces that may have come away from the mouth. From experience, if other fish were to eat this they can develop bacterial infections too (mainly bacterial Popeye).