I suppose I could try this as I have nothing else to lose. It doesn't necessarily help me understand what has been going wrong though. My best guess right now is that EI is causing all of the issues because my tank isn't planted heavily.
Also, I've been performing your suggested cleaning and husbandry for months now. What you see is what I get after 5 days after cleaning with the current setup and plant mass.
Show us a picture after its all clean again
If you really want to solve your problems you need to plant much more heavily, you are trying to run a tank on hard mode. High Water Column Ferts, Hard Water, Lots of Hardscape, Low Plant Mass, Active Substrate, this is a tough tank to balance.
But if you are impatient you should start again, tear it down, use an inert substrate, plant heavy, get at least 1 point CO2 drop, use lean water column ferts and start with much shorter light period.
If you read my past journal https://www.plantedtank.net/forums/1...green-17g.html
you will see I had a lot of problems when dosing high ferts and 'EI'. I had tropica CEC substrate and I could not get rid of the excess. I wanted to rescape anyway so I did and those same algae ridden stunted plants (Rotala Rotundifolia, Pogostemon Erectus, Staurogyne Repens) did much better under lean ferts and inert substrate.
I am really not a big fan of EI as it is preached here. If 'EI' is only using excess ferts and resetting them weekly with 50% water changes than I see nothing wrong with it. But for your plant mass, excess ferts is probably NO3/PO4/K 10/1/7ppm(total weekly!) and 0.1ppm Fe(weekly). Your tank is nothing like the dutch tanks you see displayed here so you can just about throw away any numbers close to their tanks.
My current tank https://www.plantedtank.net/forums/1...l#post11215369
is running on 2.124N, 0.159P, 1.6K, 0.109 Fe (Kh=5, Gh=8) (Tropica Specialized), Inert substrate no root tabs.
You have a Ca complication from your Seiryu stone but lets ignore that for now and assume you are doing weekly 1-2X 50% changes so it shouldn't build up too much.
I question your PAR values and you might want to bump up CO2 a bit to a full point, but the challenge now will be to remain patient enough to stick with lean ferts, lower light, and a lower growth equillibrium. If you can't live with it start over. I couldn't get rid of algae or get good growth from my old scape(carpet and few plants were happy) even with lean ferts for a month those 3 species were never happy, in contrast this new one has been really easy with over 12 species being happy.