Unfortunately, I have yet to have had healthy plant growth. I've had my tank up for 5 months, with what I think in theory are better conditions than my old tank, yet I have had worse conditions. In my old 26 gallon tank, I achieved approximately 0.6 watts per gallon (6500k) and only added potash and iron supplements, and in the current 50 gal I get about 3wpg (6500k), and use nutrrafin plant gro which contains half a dozen micro-nutirents. At first I thought perhaps the problem was that my tank hadn't matured yet, but I don't think that's it anymore. What am I doing wrong? I still have the stock light bulbs, so I will consider changing them and see if it makes a difference. Two just blew out anyways.... Please view the pictures attached and captions.
Here's the old 26. The only plants I had were wisteria and Hygrophila corymbosa
I took this image a few days after setup. The hygros and floating wisteria had been in the old 26. Please note how many leaves they had. Within a few weeks, the hygros lost their old leaves but I'm certain it was due to it being exposed to the air for a while prior to replanting. I have read it can be common. Sadly it hasn't looked as healthy as day 1. I eventually tossed out the floating wisteria which was previously in the 26 because it looked quite ill after some time.
This wisteria was bought new. It is still in the tank and has had continuous growth, but the lower leaves always die off, which wasn't a problem before.
This is a current image. As you can see, the wisteria and hygros bottom leaves always die off. The wisteria are in the right corner. The anubius plants have done well, although a few weeks ago they had nasty algae growing. The swords have done ok as well.