Why do you plan on using two different bloom ferts? One or the other but not both. Get a cal/mag product and follow the directions on the container, giving a dose soon. I wouldn't wait until Monday. Wait a couple weeks and give another dose, and that should be good until they're done. Don't mix the cal/mag with your other fert however. mix each with their own waters to avoid the calcium and phosphorus from binding to each other. Only get the cal mag if the alga doesn't have calcium and mg in it. Pick the bloom fert that has more stuff in it. Canna might be easily absorbed but it may not have everything plants need. Let them grow another ten inches, then tranplant to larger containers, using same soil.