Plants bubbling like crazy
So today is a nice sunny day, for January anyways. So I have my front door open and it's letting direct sunlight into about 1/3 of my tank. I just happened to look over and my crypts and stems are putting out bubbles like crazy. It's just a standard 29 gal tank with two 24" t-8s normaly.
I have diy co2 dose comp 2xweek, excel daily, kno3 3/16 tspn and KH2PO4 3/32 tspn once a week.
Are my plants telling me with this direct sunlight that they want more light than just my 2 t-8s? I'm curious because I've never seen them bubble so much so fast as I do now.