I dose Flourish Excel daily, Flourish micro every 3 days and my lamp is on for 7 hours. I have around 1.4w/UK G.
It took some time to establish because I had such a broken piece of frogbit to start with but once it started going every few days it would start growing a new branch at the extended reach and then would break off forming a new plant and then every few days after that it would form another one. Really only took 3 weeks to get 7 full sized floaters out of it. I don't know how to get it to flower though!
I I don't have any surface agitation annoying it though and I've allowed the roots to tangle up in the amazon swords to keep them anchored in some sense. I use a basic floating weed to break up the surface agitation and act like a wave breaker by forming a ring around it.
In fact now I think about it, my plants have exploded in growth recently since I was on holiday. One of the swords has tripled in leafage, the bulbs have grown to half the height of the tank and doubled in leafage. The Crypt popped out a brand new leaf out of no where and had grown that to full size in 2 days. I wish my house plants were this good! The other plants I don't know their really names too...
However I have noticed my Java moss has been melting since adding the plant ferts, however it seems to have started to recover and grow back again.
I also managed to find a coconut in my local super market! Time to make some hide outs!