reddish brown lines in tail fins??

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SharpieItBlack

Aquarium Advice Regular
Joined
Jan 28, 2013
Messages
90
Ok so I just got over a battle with fin rot. After the upgrade to a 30 gallon he was doing better! The gel food seemed to help too. But recently I'm seeing him go back to how he was like during the fin rot. Sluggish and lazy like. He's the only fish in a 30g. I do pwc each weekend, so once a week. My water tests are normal unless it's lying to me :/
I inserted the best pic I could get. In his tail at the tips there's like red lines and a few ones going the length of his tail fins, to his body.
I was thinking that septicemia, but it seems as it is being caused by nothing unless it's the food. But I'm using the same recipe as when I first started the upgrade.
I have this maracyn treatment or mardel I forget the name.
Any foods I can try?

ForumRunner_20130403_120052.jpg
 
Someone please help... I don't want to wake up tomorrow and he's gone
 
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