I was wondering if it was still cycling. I had never used stability before, so I didn't know if it was already cycled from using it. I'd definitely check your levels though to see where they're at.
What are you using for mechanical filtration? When I fired up my 750 it was crystal clear in 48 hours, and I'm only going down to 100 micron.
Why wouldn't you seed that filter with media from the smaller tank? Should cycle in like a week if seeded. Have you had Nitrite or ammonia present for the last 6 weeks?
Stock looks super fancy! Obviously things must be going well for you financially, it would take me months to pay for the stuff you've bought since this thread started...... lol
The only way to keep the poison in check until your bio catches up is fresh water period.........Ammonia level is .25 ppm
Nitrite level 2.0
Nitrate level .50
That's what I got when I tested my water tonight....