Hey Conrad,
I got my red algae in the mail yesterday. I had no idea I was buying the quantity of a pop can lol. I can't understand the Web site from the link lol its in Italian. I sent them an email asking how to order a week ago but they haven't got an email back. I'm going to go check the UK ebay.
So last night I added 1/4 cup to 5 cups of worm castings and mixed it together. Then I top dressed the plants with about 1.25 cups each. I worked that into the top inch of soil. Then I mixed a batch of water with 4.5 gallons RO water 1 cup budswell (liquid bat guano) 1/2 cup liquid fish 1 cup fulpower (humic acid) and fed them with 1.25 gallons each.
If you're wondering why i'm telling you this, today when I went in the tent they looked the healthiest I've ever seen them throughout the entire grow. Do you think that red algae could make a difference that fast? I guess it could be a placebo but I swear they got a full shade darker and a little more waxy overnight. lol, I'm probably imagining things.