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I've got a relatively new 33g (about a month old)so it is still cycling. I have 1 bristlenose, 4 cory's and 6 neon's. For the first couple of days the neon's acted as I would have expected, but then they suddenly went into hiding. They would only come out in the dark (even sunlight, and the tank never receives any direct light, was enough to send them into hiding). I have since removed their hiding place (there are still plenty of places for them to hide if they're feeling shy) and I have noticed that while they've been away, they've developed some sandy brown spots. I'm not sure if they're external or internal, as they only seem to be visible where their bodies are clear (mainly on the tail, but one has them all over). They don't seem to have any other symptoms, they are feeding OK and they're not scratching or anything like that. None of the other fish seem to have this problem either.

Any ideas what this could be? How do I treat it?

Any help would be much appreciated.

It is possible that the tank has not fully cycled, or they are still showing signs of stress,or even both.
You could add some type of stress coat to help them also keep a good eye them as it could be Ich.

When I introduced my 6 Cardinal Tetras to my established Betta tank they were always hiding, by introducing more they are now all swimmimg very happily all over the tank.

It would help if you posted all your water peramiters.

Have a look in [link=My Profile] http://www.fishprofiles.com/forums/member.aspx?id=1935[/link] for my tank info

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Betta 11Gal Desktop & Placidity 5ft Community Tank Photos

Keith

Near enough is not good enough, therefore good enough is not near enough, and only your best will do.
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The brown spots may be described as a symptom of a number of problems - see http://www.fishpalace.org/Disease.html.

My choices would be:
o Fish louse,
o Neon tetra disease
o Hemorrhagic septicemia

Since your tank is still cycling, my vote would be for hemorrhagic septicemia.

__________
"To steal ideas from one person is plagiarism; to steal from many is research."
researched from Steven Wright

Sorry for the delay in replying (connection problems!)

My current water readings are:
P.h. - 8
Ammonia - 0
Nitrite - 0.1
Nitrate - 50

Admittedly when I first posted this query I had a much higher Nitrite reading.

Thanks for the suggestions, I've learnt some new conditions that I didn't know before, but none of those diseases looked similar to what my tetra's have. I'm beginning to think that it must be something to do with the cycling, as the Nitrite has decreased the spots seem to be disappearing slowly. Still no idea what it is though

The tetra's are slowly coming out though, there is only one that remains in hiding most of the time (he comes out for about 30 mins per evening). Don't really want to add more fish to the tank at the moment until either the spots clear up, or I work out what's wrong with them and how to fix it.

Thanks for your help.

You are giving yourself some exellent advice dont add any more fish until every this setles down.

Have a look in [link=My Profile] http://www.fishprofiles.com/forums/member.aspx?id=1935[/link] for my tank info

Look here for my
Betta 11Gal Desktop & Placidity 5ft Community Tank Photos

Keith

Near enough is not good enough, therefore good enough is not near enough, and only your best will do.
I VOTE DO YOU if not WHY NOT?
VOTE NOW VOTE NOW

I'm beginning to think that it must be something to do with the cycling, as the Nitrite has decreased the spots seem to be disappearing slowly.

You have summed it up yourself. High levels of ammonia/nitrite/nitrate will have effects such as you have seen with your neons. Neons can be a very sensative fish (not recommended for a cycling tank) which is why you are not seeing it on the other fish.

I agree with bob that it is most likely Hemorrhagic septicemia.

---

Before you criticize someone walk a mile in their shoes. That way you're a mile away and you have their shoes.

You are a genius Waldena, follow your own advice and they'll all be alright on the night. And have you considered your housemate drawing spots on them and now they are slowly washing off?
I wouldn't trust him.