- Have you tested your water?
- Yes
- If yes, what is your ammonia?
- 0
- If yes, what is your nitrite?
- 0
- If yes, what is your nitrate?
- 10-50 (I let it creep higher but have been keeping it at about 20 now with weekly WC)
- If I did not test my water...
- ...I recognize that I will likely be asked to do a test, and that water tests are critical for solving freshwater health problems.
- Do you do water changes?
- Yes
- What percentage of water do you change?
- 41-50%
- How frequently do you change your water?
- Every two weeks
- If I do not change my water...
- ...I recognize that I will likely be recommended to do a water change, and water changes are critical for preventing future freshwater health problems.
Hi all,
I had 5 young male Gymnogeophagus balzanii for a couple of months in a 75g. 2 weeks ago I sold off the other males to keep the dominant male. Remaining male started acting a bit twitchy but I chalked it up so being skittish without its tank mates. Now it’s developed 3 raised slightly yellow bumps on 3 fins: one on dorsal fin, one on tail fin, and possible a swollen fin ray on anal fin. Today some red irritation appeared at the base of a pectoral fin. I have a video that shows them much better but I couldn’t attach it here (are videos uploadable?)
Any ideas what this might be? Never seen anything like it in any of my tanks. Cherry barbs, plecos, panda garras in this tank all seem fine. I think these Gymnos were grown in outdoor ponds in Florida. I treated with Prazipro prophylactically when I first got the fish (these bumps werent visible then).
Tank is a 75g, low stock, unheated, been at about 64-68 since I set it up. Currently in a cool water period for the Gymno.



I had 5 young male Gymnogeophagus balzanii for a couple of months in a 75g. 2 weeks ago I sold off the other males to keep the dominant male. Remaining male started acting a bit twitchy but I chalked it up so being skittish without its tank mates. Now it’s developed 3 raised slightly yellow bumps on 3 fins: one on dorsal fin, one on tail fin, and possible a swollen fin ray on anal fin. Today some red irritation appeared at the base of a pectoral fin. I have a video that shows them much better but I couldn’t attach it here (are videos uploadable?)
Any ideas what this might be? Never seen anything like it in any of my tanks. Cherry barbs, plecos, panda garras in this tank all seem fine. I think these Gymnos were grown in outdoor ponds in Florida. I treated with Prazipro prophylactically when I first got the fish (these bumps werent visible then).
Tank is a 75g, low stock, unheated, been at about 64-68 since I set it up. Currently in a cool water period for the Gymno.






