Thanks Tom,

So when you say that "my CO2 is now good", are you basing that off my excelerated algae growth?

I had moved one blyxa, and also removed two larger pieces of slate with riccia tied to it, to give to a friend. I suppose that was as much of an upset as much as any replanting. So basically, if I create a puff of crud, it's nesseccary to do a water change?

Fortunatly my riccia hasn't really been hit by the algae, except for one 1/2" spot of it that has some BGA. But everything else is hit. So should I trim everything as low as possible before the blackout?

It would be great if I could let the HC smother the staghorn. That would be my prefereable method anyway. It took a long time to grow in.

Hopefully I can score a bottle of excel tonight. My local LFS had one left on Monday. If so, I will start your suggestions tonight.

Just out of curiosity, will algae that is currently attached to plants die under the right conditions, or does it always have to be removed?

Thanks Tom!