My year and a half old red cap, Jack, has always had red veins showing in his fins, sometimes more, sometimes less. Right now he's in a more phase, so all the fins have a pinkish tinge, although the attached pictures exaggerate the color quite a bit.
20 gallon tank
Water parameters; amm 0, nitrite 0, nitrates usually 10 before a water change, occasionally 20. 5 after a weekly water change of 9 gallons.
I've seen pictures of redcaps with red veins and without. It makes sense that you'd see red blood through a thin white fin, but is this a problem or is this in the range of normal?
No frayed edges, no open sores or abbrasions. He eats well, is active and growing.
Twice over the past year and a half I have tried a treatment for this, once I ran a course of Maracyn Two and this spring tried Pimafix. I didn't notice any change.
I plan to move him and my new ryukin to a 75 gallon tank this week, but if there is any treatment recommended I'd like to do it while he's still in the 20 gallon tank.

20 gallon tank
Water parameters; amm 0, nitrite 0, nitrates usually 10 before a water change, occasionally 20. 5 after a weekly water change of 9 gallons.
I've seen pictures of redcaps with red veins and without. It makes sense that you'd see red blood through a thin white fin, but is this a problem or is this in the range of normal?
No frayed edges, no open sores or abbrasions. He eats well, is active and growing.
Twice over the past year and a half I have tried a treatment for this, once I ran a course of Maracyn Two and this spring tried Pimafix. I didn't notice any change.
I plan to move him and my new ryukin to a 75 gallon tank this week, but if there is any treatment recommended I'd like to do it while he's still in the 20 gallon tank.

