Can you tell us how old and how large the sharks are please? There are a few possibilities I can think of that would cause the faded color you mention. 1 of those is maturity. Irridescent sharks lose the black line as they get older and begin to mature. The other potential cause is stress. If these sharks are beginning to mature and are kept in a group that will cause a great deal of stress and eventually they will begin to fight. Irridescent sharks school while they are very young but as they begin to mature they are solitary and leave the safety of the shoal to set off on their own. If kept together for too long they begin to fight for territory. The stress involved in the fighting can cause their color to fade, and the rank of dominance among them can also cause their color to fade.
Yet another cause could be water quality. Have you tested your water and can you post the test results for ammonia, nitrite, nitrate, and pH?
I hope you are aware that even 1 irridescent shark cannot stay in a 90 gallon tank for real long. These animals grow very large, averaging about 4 ft long each at full grown. This is one species that gets sick and dies quite easily if it's tank is too small, if water quality isn't optimal at all times, or if the stress levels rise quickly, suddenly, or remain a constant problem.
I hope this helps.
Dawn
--- In AquaticLife@yahoogroups.com, Faisal Ashraf <faisal.ashhraf@...> wrote:
>
> Hello Friends,
>
> I have seen that out of 6 Iridiscent Sharks / Blue Line Sharks in my 90
> Gallon tank, 2 of them is having faded color as compared to others. While
> remaining sharks have Black / dark blue in color.
>
> I am afraid that what could be the reason of such. The fishes are quite
> active in Tank & swim efficiently.
>
> Is there anything that has to worry. Please share your expert opinion.
>
> Regards,
> Faisal
>
>
> [Non-text portions of this message have been removed]
>
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