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Forum > The Goldfish Topics > Disease Diagnosis/ Treatments > Diagnosis & Discussion
leann722
Hi i have two black moors and one little fan tail in a 20 gallon, and recently one of the black moors has gotten red eyes, he still swims around and i believe he eats. Ive noticed this brown stuff on the tank i dont know if that has anything to do with it because the other two doesnt seem to be fazed by it. Granted ive been going through alot recently so i havent kept up on them quite as well but the tank is still clean except for the brown stuff. I added salt and melfix as its all i have, will this help it or do i need something different?
emmahj
Hiya

Can you give us a little more info. about your tank setup? How long has it been running, how long have you had the fish, what your feeding / cleaning routines are, and especially what the ammonia, nitrite, nitrate and pH levels are? Basically all the stuff in the red box at the top of the screen - this will help us give you an accurate diagnosis of the problem. smile.gif

I will say though that sudden redness on fish is often due to high ammonia levels in the tank (these burn the fish's skin). If your tank is new or you've recently added fish or you haven't been able to clean it or perform water changes in a while, this may be the cause. I also noticed you have 3 fish in a 20 gallon tank, which means it is actually a bit overstocked. GF really need at least 10 gallons each and ideally 20 gallons each! Sounds a lot, but these are very messy fish which quickly pollute their water, thus building up the ammonia. Anyway, if ammonia is the problem then a large (ideally at least 50%) water change is the immediate answer, followed by close monitoring of ammonia/nitrite and more small water changes until the tank's biocycle settles down. You may also have to consider improving your filtration system and / or increasing your cleaning and water changes. If you're not sure what the biocycle is let me know and I'll go through it.

The brown stuff sounds like algae; this is usual in most tanks and there's not a great deal you can do about it except clean it off regularly! You can try adding more live plants to use up nutrients in the water, reduce the amount of sunlight the tank receives or use a store-bought algae remover (though I've never had much luck with these). It's not very pretty but it won't harm your fish.

Anyway, keep us posted!
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