An update to my previous post! About a week after I wrote the above, dark red/rust colored solids began to collect at the bottom of the vial. As time passed, more of these particles collected and the brew became more clear as each day passed.

In the kit used to brew the Fina, there was a .45um whatman filter. I purchased new vials and .25 Whatmans. I refiltered the contents of the cloudy vial through the .25 (took about 40 min per 50 ml vial). What resulted was a perfectly clear, golden colored oil. The whatman filter turned rust colored, letting me know that it had caught the particles.

It's been 4 days since the refilter and the vials of Tren/Fina are as clear as on the first day.

The next time I brew Fina, I'll heat it after it's been dissolved and the oil added, then let it sit for at least 24 hours. I may filter twice just to make sure the oil doesn't cloud up again.

I hope this helps to clear things up a bit, especially for newbies just trying this for the first time!