Angles more susceptible to fin rot

[CWO4GUNNER]

It seems that unless I do a water change like clockwork every 7 days to my angel tank, little bits of rot start to appear on their fins even if all toxins are zero but my nitrates are only 20 PPM. That is about all it takes to start seeing bits of fin rot. Change the water every 7 days and it all goes away and stays away, but wait 9 or 10 days before the next water change and the fin rot starts showing up while my other 3 tanks are doing fine at 20 PPM Nitrate. I hate to break out the python twice in a week so if I have to do the angle tank, I have to do them all.

Question, how long between water changes for your angels and what nitrate range do they seem to tolerate 5-10PPM, 10-20PPM, 20-40 PPM?

 

[Luvbugz]

I used to do water changes weekly with my angels, but now I have changed to a biweekly schedule (my plants seem to be growing more ). My nitrates never get above 40. They usually stay in the 20 - 40 range. Never had any problems with fin rot on my angels. I wonder why yours are so senstive?

 

[Riiz]

My nitrates never get above 20ppm, but I do 50% weekly water changes on all my tanks though.

 

[CWO4GUNNER]

Can only do 30% max, usually 25% in summer because the source water is 90-95F cold. With a sprayer and only 25% the water temperature only raises 5F to 85F. Anything more and they get stressed because O2 levels drop. Before next summer I need to come up with a DIY a windowsill nitrate filter using algae like they do for saltwater and put some of that strong sunlight to work.

 

[Star_Rider]

I find nitrate itself is not a good barometer for issues like fin rot.

my source water is 20 ppm but many of my tanks are planted and stocking is light. my tanks can get as high as 40(rare with the plants)
before my tanks were planted I had an angel tank hit 80+ nitrate ..no issues with the Angels,

I do at least 1 50% WC weekly often I do 2 in tanks I feel are heavily stocked...

 

[ksane]

I do 75% weekly on all the tanks, nitrates stay below 10 ppm. My Angels are the Vieltails-is that what yours are? They seem to get.....almost thread-like splits in their super long stringers but its not fin rot. Could that be what you're seeing?

 

[cris gaston]

Fin rot, IMO, is caused by bacteria. Maybe the problem here is that you have the pathogens present in the tank and when you have deviations in the water parameters, the infection goes to a clinical level and you see the fin rot. It may be wise to treat your tank completely for bacterial infection like moving the fish to a quarantine tank for treatment while you clean and disinfect the infected tank.