Will disease die out with Eel in the tank?

[YellowThunder]

So I need opinions, I have a 125 gallon aquarium and a panther grouper and Lionfish passed on. I tried so many times to save them but nothing worked. I couldn’t identify a disease however they just stopped eating for 1 month both came back to eating then stopped again and 2 weeks later they died. I am leaving the tank now to let the disease die however there is a snowflake eel in the tank that is absolutely fine. Eating super active and always hungry I was wondering if the disease will die out in 3 months with just the eel in the tank. I was also asking for opinions on what the disease could be. Thanks!

 

[lion king]

When your fish came back to eating, was their appetite seemingly insatiable. If so this is a sign of internal parasites. How long did you have them before they initially stopped eating? Did they come from the same source? Does all your water parameters check out, especially ammonia? How old in the tank and was it fully mature with substantial enough biological filtration to support an ammonia spike? These type of fish will produce alot of waste at once and can produce an ammonia spike routinely if under filtered, this over time will effect the health. Where you feeding any live food, if so, what? If the eel has been eating live food or they came from the same source as the other fish, internal parasites could be considered, and they won't die off on their own. General cure would be the treatment. Where there any physical signs of disease, cloudy eyes, flashing, swimming at the surface or into heavy flow, faded color, etc.?

While eels are very resilient towards many diseases you must maintain optimum water conditions and a fresh, human grade varied diet, low in thiaminese and with proper fats. For info on good diet choices for eels, click my name and "find all threads"

 

[YellowThunder]

When your fish came back to eating, was their appetite seemingly insatiable. If so this is a sign of internal parasites. How long did you have them before they initially stopped eating? Did they come from the same source? Does all your water parameters check out, especially ammonia? How old in the tank and was it fully mature with substantial enough biological filtration to support an ammonia spike? These type of fish will produce alot of waste at once and can produce an ammonia spike routinely if under filtered, this over time will effect the health. Where you feeding any live food, if so, what? If the eel has been eating live food or they came from the same source as the other fish, internal parasites could be considered, and they won't die off on their own. General cure would be the treatment. Where there any physical signs of disease, cloudy eyes, flashing, swimming at the surface or into heavy flow, faded color, etc.?

While eels are very resilient towards many diseases you must maintain optimum water conditions and a fresh, human grade varied diet, low in thiaminese and with proper fats. For info on good diet choices for eels, click my name and "find all threads"

I had the Lionfish and Panther grouper for year and a half then they stopped eating. I checked ammonia multiple times and it wasn’t the problem. The tank was well over 2 years and the tank was never fed live food. Diet consisted of silver slides, shrimp, chunky LRS and also krill. I did see what seemed to be a red sore on the lionfishes mouth however and also he would consistently keep his mouth open. The panther didn’t show many signs of anything as he was pretty normal except sometimes would hang out near the wave maker. As a question how do you use general cure for the whole tank?

 

[YellowThunder]

I had the Lionfish and Panther grouper for year and a half then they stopped eating. I checked ammonia multiple times and it wasn’t the problem. The tank was well over 2 years and the tank was never fed live food. Diet consisted of silver slides, shrimp, chunky LRS and also krill. I did see what seemed to be a red sore on the lionfishes mouth however and also he would consistently keep his mouth open. The panther didn’t show many signs of anything as he was pretty normal except sometimes would hang out near the wave maker. As a question how do you use general cure for the whole tank?

Now reading your other posts I have been feeding hikari silver slides and krill. I don’t know if that may have contributed or not.

 

[lion king]

I had the Lionfish and Panther grouper for year and a half then they stopped eating. I checked ammonia multiple times and it wasn’t the problem. The tank was well over 2 years and the tank was never fed live food. Diet consisted of silver slides, shrimp, chunky LRS and also krill. I did see what seemed to be a red sore on the lionfishes mouth however and also he would consistently keep his mouth open. The panther didn’t show many signs of anything as he was pretty normal except sometimes would hang out near the wave maker. As a question how do you use general cure for the whole tank?

As far as the lionfish goes, it could be to a nutritional deficiency and thiaminese poisoning. Hikari silversides is a minnow and krill together would be very high in thiaminese. The gaping mouth is a sign of vitamin B1 deficiency, which is caused by thiaminese. Most times with a lacking diet it could only take several months for it to be an issue. The panther grouper could be unrelated as they could thrive much longer on a lacking diet and are not as affected by thiaminese. Panther groupers many times go under fed, as they eat alot, mamny just slowly starve being malnourished. A small panther grouper could literally quadruple in size in a year to a year and a half. If you haven't added anything recently and were not feeding live marine fish, I wouldn't suspect disease. Unless the eel is a new addition and they are eating fine, I wouldn't suspect disease, read some of my threads on eels and suggested foods, be careful as eels can suffer from thiaminese poisoning. They also need a fatty fish, I recommend wild caught skin on salmon.

As far as general cure goes, it is dosed in the water column, per package instructions. Be careful to dose to water volume not tank size. If you didn't calculate the actually water volume while filling, consider displacement by estimating the volume of water removed from rock and substrate, and add in actually water volume held in the sump.