Yeah the filter I'm using on the QT tank is a HOB with two filters with carbon in the insides.
Not really my first choice for a filter lol
I'm going to start the 55 as a holding tank for new fish and use a big Eheim with live rock rubble in it instead.
The purple doesn't look like he's getting worse BTW, maybe even a little better.
Having done the following seems to have made him happier:
- Bigger Tank
- Tons more natural light
- More Nori (food in general)
- More Flow
- More Live Rock
- Removed Carbon
- Upped Vitamins
Hopefully in 3-4 weeks he'll be a lot better and be ready to be introduced to the 240 with the Yellow Tang at the same time. Would hate if he wasn't 100% to be introduced to the Yellow.