Yes, just the dorsal fin. But it doesn't look nipped, no pieces
missing. They look split apart ... when they flare, there are two or 3
pieces separate pieces now .. all whole, just separated. If nipped,
wouldn't chunks be missing?

On Tue, 8 Apr 2003 21:09:49 +0100, "Tiddleye" 
wrote:

> Tetras are of the pirhana family..... there are also some that are "fin
>nippers".... I would ahzard aguess that this is your problem... the males
>are choosing who'll be top dog and are nipping each others fins..... is it
>just the dorsal fin that is affected?
>
>Tiddleye
>"Debbie"  wrote in message
>news:cmn49vgthqbgifip3ui7q7557q8odfj5bq{at}4ax.com...
>> Can anyone tell me if the male black phantom tetras top fins are
>> supposed to be "split" in the middle??
>>
>> This is really worrying me as we have 9 phantoms, 3 males 6 females
>> that we have had about a month and as the males are growing larger
>> whenever they "display" their fins to each other and
turn coal black
>> the top fins are now split in 2 or 3 pieces which I did not notice
>> before. They look a little raggedy as well.
>>
>> The females do not have this but their fins are much smaller. The fish
>> are acting fine. I read about fin rot and don't really think that is
>> what is wrong but I do not know. There are no white edges or see
>> through parts and it does not look like the fins are getting smaller,
>> just shredding.
>>
>> I have a 29 gal established tank which I do 10-20% water change
>> weekly. Last time I tested water about a week ago I had 0 ammonia, 0
>> nitrites, and about 40-80 nitrates. Hard to tell on that one due to
>> color. The other fish in the tank are 9 Cardinal tetras and 3 pepper
>> cories. So no other fish are harrassing the phantoms, other than the 3
>> males frequently chasing each other. We have two filters, a hang-on
>> and a ug with a powerhead. Both are turned down to the point of not
>> creating excessive current, so the fish are not fighting to stay in
>> place. The ug is going to be removed in a few weeks (or sooner) in an
>> attempt to better control the nitrates. The tank has been set up going
>> on 7 or 8 years, the ug came with it when new.
>>
>> Any suggestions appreciated.
>>
>
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