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Old 28th August 2009, 19:28   #1
machonachos
 
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Location: Pembrokeshire
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Default Fish turning grey... then dying

Got home the other day and my black mollie was dead. Besides having been stripped quite heavily by the other fish what i noted was that it was almost completely grey! Now i see two of my Harlequins are going grey... losing colour and ther other fish are chasing them off...

Any ideas?

Tested tank as soon as i saw molly dead...

Water Quality
Ammonia - 0
NitrIte - 0
NitrAte - 20
pH - 7.5 (always steady at this value)
KH - 180
GH - 260
Water Temperature - 24 C

Tank Specs:

Tank size - 70l
Filtration (Make, and GPH) - Juwel internal
Tank Inhabitants (How many, how big?) - 5 harlequins, 5 glowlights, 1 mollie (RIP), 1 betta... 2 amanos and 2 zebra nerites

Other:

How long the tank has been set up - 8 months
Frequency and amount of routine water changes - 25% weekly
What you feed , how much and how often - daily king britich flake
Water conditioner used - aqua+
New fish or plants added to the tank? - Zebra netrites were last addition about 2 weeks ago
Medications used - Melafix
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Old 28th August 2009, 20:09   #2
matsp
 
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"Velvet"?

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Old 28th August 2009, 20:14   #3
Little Fish
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It sounds as if it could be velvet. Does it almost look like a kind of mould that covers the fish?
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Old 28th August 2009, 23:05   #4
machonachos
 
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Hmm maybe my description wasn't great... it isnt anything solid and visible per se. It really seems to be a lack of colour or losing colour in the case of the harlequins.

Molly was acting strangely and i had noticed it... in the day she seemed to be fine but once the lights went off she would swim like crazy in one corner. Don't really thing anything was bullying as i never saw anything and no fin damage or the like.
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Old 29th August 2009, 08:51   #5
Little Fish
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OK, it's hard to actually say what it could be without seeing them. It could be a bacterial problem that has spread from the mollie to the harliquins.

Is it possible that you could add a photo of them to this post?
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