What's hurting my plants?
So this is my first attempt at a high tech 10 gallon planted tank. I originally was just planning on a regular fish tank for my apartment, and went out and bought the basics: reef sand, water conditioner, some danios, and two species of baby tears (not dwarf, one of them is micranthemoides the other I can't remember). I quickly realized that this setup wasn't enough for me, and decided to finally take the dive and do a high tech setup, I had read about this for about a year and was tentative to delve into something that required that much maintenance, but in the end it's what I wanted.
At this point in time, I've had CO2 running for a few days with about 2 bubbles per second, it is turned off for the night, and lighting was 10 hours (I turned it down to 7 yesterday when I noticed some green algae). I dose FloraPride (3% K2O and .19% Iron) which I know isn't sufficient, but I have the whole line of ADA fertilizers and substrates set to arrive tomorrow, at which point I will entirely rescape the tank and begin the cycle anew, starting with almost the exact same setup process as the greenmachine staff do in their aquascape videos.
The only problem remaining now is that my growth is a little spindly and the bottom leaves have been dying. A few days in I switched out my two 15W T8 bulbes for an aquatic life 2x20W T5HO hood (1x6000k and 1x650nm), which from what I read gives me 4 watts per gallon and should be very high light, and more than sufficient. I also have hard water according to the all in one test strips I use, I have a KH and GH test kit arriving in the mail tomorrow so I'll be able to get the ppm down. Could this be happening to my plants from nutritional deficiency? Do you think switching to a quality substrate and liquid fertilizer will fix my problem? Or do I still need more light? (hard to believe) Maybe it's something else entirely, like GH or KH? I'm going to try a glossostigma carpet in the new setup, but I'm afraid the plant won't thrive if something already seems to be off.
I've attached photos. There are two of the tank before I upgraded the lighting, then there are photos of the tank as it is, with both the rotted bottom of the baby tears and the new kinda spindly growth on top.