Planted Tank VIP
Join Date: Jul 2002
Location: Victoria,British Columbia, Canada
Ok.. The pennywort looks like its got some Black Brush Algae, nasty stuff, but SAE's eat it so its not too harsh. It doesnt look too bad yet on that plant so thats in your favor. Pull off any infected leaves, and leave the SAE's to clean up the traces (assuming you have some).
Actually after looking at the sword it looks like it has some spot algae and very young brush algae as well. it hasnt developed into full tufts of hairs yet, but I recognize it all too well. I had to fight the stuff for a while in one of my tanks.