Bolivian Ram beginnings of fin rot?

[HelplessNewbie]

This 1 of 2 Bolivian ram added to my 20 gallon long 10 days ago. It has a blackish fin (the really long ones under its belly, the ones used to stop short). Is this the beginning of fin rot? Should I quarantine him just to be safe? The other one's fins seem to be okay, clear colored.

Edited May 21 by HelplessNewbie

[Colu]

That natural colour to fins if you look up picture of bolivian ram they have a  black line to there pelvic fins 

[HelplessNewbie]

On 5/21/2024 at 6:37 AM, Colu said:

That natural colour to fins if you look up picture of bolivian ram they have a  black line to there pelvic fins 

Oh!!! That's a relief. Out of the 8 we have here, this was the only one with an obvious black on the pelvic fins. Does this indicate it is more mature than the others?

[Colu]

On 5/21/2024 at 12:04 PM, HelplessNewbie said:

Oh!!! That's a relief. Out of the 8 we have here, this was the only one with an obvious black on the pelvic fins. Does this indicate it is more mature than the others?

If there young that might just be starting to get full adult colour

[HelplessNewbie]

On 5/21/2024 at 7:10 AM, Colu said:

If there young that might just be starting to get full adult colour

The guy that sold them to me 2 months ago said that these were "nearly adult sized", so I guess these were young.

Edited May 21 by HelplessNewbie