That's a really nice tank! I love your choice of species and the balance between colors and leaf shapes. Nicely, nicely done. Is it possible to let the stems on the right side, especially the rear corner, grow up to the top or does the spray bar bend them over?
You have sharp eyes. It is exactly the right side where I need to work on. The overflow box in the way and the force of the output water make it challenging.
cah925, tried a dual photoperiod? i.e. split an 8hr photoperiod into two 4hr's separated by a few hours...I've read that as a successful way to deal with algae.
And/or try increasing CO2 a lot and reducing fertilizer a lot to experiment. My 46G BF is also full of nana petite. It was fuller with nana before I took out a good chunk to seed the 125G. It has a ray 2 and a dual T5, so very high light, but some how I got lucky that algae don't attack the plant. There are BBA on the hardware and visible GDA on glass, but plants are algae free. I guess healthy plants are able to take care of themselves.