Planted Tank Guru
Join Date: Jun 2004
Location: Baton Rouge, LA
How recently? Many plants will take a few weeks to respond to major changes. Some of the ones you listed can be particularly slow about it.
Do you have an idea how much CO2 is actually in the tank? I always recommend using a drop checker, with a 4dKH solution. Other methods of estimation are less accurate, especially bubble count. You probably have high light or near it, so try to maintain 30ppm. Increasing it a bit more may help if you start having problems with algae. But don't go overboard. Some try to cure any algae problem with CO2 alone, resulting in ridiculously high CO2 levels. It's a brute force approach, that when necessary usually indicates other problems that should be addressed instead.
As for your concerns about too much ferts causing algae, it's not as straightforward as that. In general, they do not. If you go waaay overboard, it can actually slow plant growth, and algae results. In some uncommon cases, trimming back some particular fert that wasn't at excessive levels may reduce algae, but that's so highly dependent on the particulars of the tank as a whole that there are no hard rules; and what works for one will not work for another.
You can get a pretty good idea what's going on, and soothe your fears, with just a nitrate test.
Shoot for 20ppm, though anywhere from 10-40ppm is acceptable. If you go outside that range, scale the entire EI recipe up or down as needed.
If at any point you find yourself about to scale it down past what (ignoring the nitrate test) you think should be normal for your tank setup, then you may have a large N/P contribution from fish food. Do not further reduce micros (CSM+B). Continue reducing N/P, but replace that (and any future) reduction in KNO3/KH2PO4 with an equal addition of K2SO4, so that the total measurement no longer drops.
If at any time you start seeing more green spot algae on the glass, but plant growth is otherwise good, bump up P gradually until it's under control. GSA is the natural phosphate test. If it doesn't respond well to extra P, then reduce lighting intensity and/or photoperiod.
Pretty easy, and requires a minimum of gizmos.