Yeah, it's packed. Of course, this is why everyone asks if there are even fish in there...
Part of the success is the light feeding. The plants help, but honestly the tank has never shown any nitrogen problems--no spikes at all. I've had it up for about a year now, and all the plants have doubled in size. I have gone for 2 weeks without a water change with no problems--truthfully, I do the water changes that frequently in order to get the water for our office plants. I also have an AC 150 on there, with just a sponge. The sponge gets rinsed at each water change.
The kuhli's are very social, and have a nice nest under the wood. They are about 3 inches in length, and big around as a pencil.
The gouramies range from 1.5 inches to a shade over 2 inches, with great color and behavior.
I certainly don't recommend this setup to everyone. It works very well for me, and is very easy to care for. This tank is much stabler than my 2.5 (one juvie kuhli, who hitch hiked in on the drftwood, male betta and a ramshorn snail, one large anubias). That tank must have a water change every third day or the cyano slime takes over.