Originally Posted by davebailey46
I have not seen him eat since being put into main tank....
This is a rather large concern. The longer the fish goes without food, the lower it's immune response will become. Not sure if in such a short time frame this would be a contributor or simpley adding to a pre existing problem. In any event, it is very important to get the fish eating again so it can rebuild it's strength and fight off the possible viral infection that may be present.
The first thing I would try is ensuring the foods fed are small enough in size to where the goby can easily injest them. Particle size can often be an issue with small fish getting enough to eat. Does it show any interest in the foods at all during feeding time and free from tank mate aggression?
If you can get it to eat, be sure the foods are soaked in garlic before hand and if possible, Beta Glucan. Adding a liquid marine vitamin to the water daily wouldn't hurt either. Zoe or Vita chem being good options as they contain vitamin B12.
In the short term, I would suggest several large water changes in the main tank to reduce any DOC
that will be feeding the problem. Even though your numbers look good, it's not the nitrogens that lend to these problems but rather the nutrient before it enters the cycle for being broken down.
Please read <<here>>
Is the QT
still set up and cycled?