Creighton

Others know far more but here's my 2 cents based on experience.

You could test your whether it is a flow issue my moving your DC around to see if its the same color throughout the tank. Is your CO2 consistent? I started have some algae problems, when I started travelling for work and CO2 ran out while I was away.

Are you stirring alot of stuff up when doing water changes or planting, the other way I have caused algae in my tank was replanting a whole bunch of stem plants. Tom's advice regarding water changes while planting or major pruning is something I always follow now.

I'd pull the val nana (or sacrifice it) and treat aggressively with excel and scrape and clean as throughly as possible and do at least a 50% water change along with it.

You have a lot of light especially using AH supply over your 30 gallon. You could go for a midday burst of a few hours at the 110W and then run 55W for the majority of the photoperiod.

For your fertilizing is the NKP your target levels or what you are actually fertilizing. For target levels I think you are fine. Based on your specs once you get the algae problem fixed your tank should look great.

Good luck