I know in the past that if I held off on water changes, bga would just grow like crazy. But I can try going every two weeks for water changes and see what happens. Or should I stop completely?

Also I'm treading a fine line with water agitation. If I slack off with agitation, bga takes over. But too much agitation and I'm losing what co2 I may have. Right now I have one hob filter plus an internal corner filter (air powered). Both are in the same corner of the tank so agitation is high there but lower on the other half of the tank. Should I remove the corner filter and just try the hob by itself?

The algae on the tank walls is a lighter green color and it's kind of growing in streaks, you can see where I scraped it off before so it's growing back where I didn't get it totally clean last time. The algae on the plants is a dark color. It looks like black edging on the leaves. Also the algae is sprinkled over the faces of the leaves too in small dark green spots. It doesn't come off freely. It's attacking my Hygro and now my Vals. Maybe I will also try the peroxide thing. Does that work on bga?