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I have six silver dollars in a large (about 75 gallons) tank along with other fish. 2 of the 6 have white fungus looking stuff on them. One fish has it on his eye. The other has it on his nose.
These fish belonged to my husband who died recently. My memory is he used tetracycline when this happened. Is that correct? If yes, how much do I put into the tank? The tank is clean. I cleaned it recently.
Thanks ahead of time for any help you can give me.
Kathleen
 

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Hello. I believe that your husband was the one interested in the aquarium hobby. You are probably ill-informed (I hope so I got all of this information to a good cause, but no offense to anybody please). In any case, if you are new, Welcome to the Hobby! I am very sorry to hear about your loss. In any case, you should probably give us a picture that way we can try to identify the other fish in the aquarium. They may be more susceptible to the disease than your current Silver dollars. The water pH level should be between 5.5 and 7.0. 7.0 is standard RO water. Below 7.0 the water is more acidic, caused typically by non alkaline substances like plants, organic material, driftwood, peat moss, and the like. Above 7.0, the water is more alkaline, caused mainly by Calcerous materials like white-colored sand (only certain varieties) and rocks. You can figure this out by vinegar tests, but this is not necessary, because I think your husband knew what he was doing based on the 6 Silver dollars. Is your aquarium planted? You didn't really give out too much information. The fish should live in temperatures between 75 and 80 degrees fahrenheit. It is hard to know what kind of help you need when we don't know what kind of fish you have otherwise. In any case, I have some treatment suggestions for you: Test the water first, and make sure the fish aren't bullying each other around. Were there new fish added to the tank recently?

Before you set this up, try to treat the aquarium with tetracycline first with directions according to the bottle or container.
- Set up a 50-60 gallon temporary quarantine aquarium. This will be set up long enough to treat the fish.
The aquarium should be set up with RO water, I think because of the Silver Dollars tolerance of Neutral Water. Do not add decorations in the aquarium. Do not aquascape the aquarium by adding sand or plants in it. This is for quarantine and treatment purposes only. If you are bold enough, please consider setting up two smaller aquariums for individual treatment of the fish, but this really isn't necessary. The aquarium should have a hang on back filter for 50-60 gallons, depending on the tank size.

Set-up process: Purchase a 50-60 gallon glass box (not a starter kit remember). Fill with RO Water (can be purchased from grocery stores. Place a 50-60 gallon heater in the aquarium and set the temperature to that of the other aquarium. Set up the 50-60 gallon hang on back filter. Fill with water (I like the brand Marineland for these cause they're efficient but a little pricey). Wait for the water to raise to the temperature of the other aquarium. Then transfer the diseased fish very carefully. Set up the tank in a quiet room for the fish's safety btw.

Use a net for these fish that is large enough. Consider soaking it first to prevent the removal of slime from the fishes bodies. That could be harmful. Transfer the fish to a bag with a net. Put water from their original aquarium into the bag before that. Then place the bag floating in the other aquarium long enough for the temperature to adapt (the temperatures in the aquariums should be the same). Then, release the fish when the temperature is suitable. Put the water from the bag in the aquarium too, since it will be treated anyway. Now, I think you should technically treat both tanks, to be safe, but we want to make sure that the diseased fish will be okay. Tetracycline I think is a good cure. Follow the directions on the bottle for both tanks. Continue the treatment if the fish is not okay still. I still want to see a pic of the fish to make sure that This is Itch disease. Fungal diseases can be treated by Tetracycline. Just follow the bottle directions.
 

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You should have cleaned it by conducting a particularly sized Water change based on the amount of fish in the aquarium and such. Really, saying you cleaned the aquarium could mean you just scraped the sides of the tank. Did you do a water change?
 

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Hobbyist, I think you might be confused as to how RO water works with relation to PH. RO water is as close to pure as we can make it, with no minerals or (hopefully) organics left over. It doesn't matter what the PH is from the system, as there's no buffer, so it will quickly fall. That falling PH will cause more issues than it will solve.

Also, recommending that someone go out and buy a $100+ tank just for quarantine isn't realistic, and neither is doing all of that just to treat both tanks anyway.

OP, what are the water parameters in the tank? PH, nitrate and ammonia levels are the big ones here. You said there's other fish in the tank? What are they, and how many? Have you confirmed they're all alive? Fungal growths are usually caused by a nutrient spike and the bacterial load it usually represents, and usually those are caused by an unnoticed fish death. I would verify no bodies are present, and then proceed with the tetracycline as directed on the packaging.
 

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He's using straight RO no DI, If he is going that route he needs to add Di to his RO buddy.
I'm confused as to what you mean here Susan? I don't think the OP is using RO at all, or at least it doesn't look like it from the post. If you're referring to the PH/RO relationship, I don't think it matters if it's been deionized or not, does it? The buffers are still removed, regardless of ions present, right?
 

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Hmm. It will fall. You are correct, I guess. I figured it would stay neutral, but with fish in there it will fall. Anyway, there will be no necessity to buy a new tank, so you could just treat the current tank. But if the treatment failed, I figured you could go get a quarantine tank. I know that one of my LFS is trying to sell 12 55 gallons for $200.00 right now because nobody wants them. I don't have enough space for them sadly. Maybe one of your LFS is trying to get rid of a cheap used tank that works? Quarantine tank isn't realistically the most valid option, but I was trying to get that across if treating the original tank didn't work out super well. I didn't know what the other fish were in the tank, but I was trying to get some information through to help treat the aquarium and/or fish. Perhaps you could try to provide a treatment solution yourself?
 
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