Sick yellow and powder blue

AChicken9

New member
My original post seemed to disappear. So trying to post here to get some feedback.

Hey guys, hoping you guys can help me. I have 2 tangs that for the life of me I can't figure out what is wrong with. One a yellow tang and one a powder blue. Here are the details:

Yellow tang: had him for about a year. Super thin, had lateral line disease due to what I think was stray voltage from a bad skimmer pump. I've stopped that and validated no stray voltage through a volt meter as well as grounding probe and new pumps. Unfortunately his fins appear to be growing back but he is still SUPER skinny. I suspected a secondary infection and/ or some sort of parasites. So then I treated (separately) with Melafix and then PraziPro. I've stepped up the feeding to 2 times a day Formula 2), nori every day fortified with selcon. Despite him eating like crazy his stomach looks really thin.

Powder blue: had her for about 6 months. She isn't "œas" skinny and in fact her stomach looks big. But the rest of her looks thin. You can see her bones.

I have not witnessed either of them pooping in some time.

Tank is mature and has been established for 12 years... 180 gallon with 70 gallon sump. 2 ASM skimmers, temp 78F. All other levels within normal limits.

I have done regular water changes (bi-monthly) lately. The only other fish in the tank is a gladiator clown which looks perfectly healthy.

Pics attached. Any ideas??

https://www.amazon.com/photos/shared...LBCJmsFwSB9qOQ
 

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The Yellow might not grow the fins back.
We can only guess @ a treatment but a diet full of algae would be best since that's their feed in the ocean.
 
Thanks, but I am feeding lots of algae.... nori and formula 2. In the past I’ve also offered live macro algae (charro), but the yellow tang never ate it

Any thing else I should try?
 
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