A bit more than a week later, and my tank has HC, is flooded and cycling. I put two Zebra/Tiger nerites in to poop up, but I think the 3 algae wafers and pinch of flakes did it's job, because ammonia and nitrates are high. Hopefully the Tetra SafeStart will make it ready for PFRs by next Monday. My HC melted a lot and has this white strandy stuff covering it. I'm dosing 1ml of Excel each day for CO2.