this is an update on my 2g jar. It has a top soil/pool sand substrate, a fluval nano filter for circulation, and I recently started dosing very dilute mix of glut/macro/micro. Light is a 65w (equivalent) LED in a clamp lamp. I did have a lot of problems with algae and slow poor growth ... and kept killing my fish/frogs until I added the filter for circulation. That really made a huge difference. This has been left alone mostly to just grow...and it has! It's a jungle in there! I do have the Fluval for water circulation and I am dosing glut and a micro/macro fert mix 1-2 times a week. The glut and ferts are mixed in and very diluted in a spray bottle and I just give it 2-3 short sprays when I dose it. Frog is doing well, too. I do harvest a handful of frogbit and duckweed and also mint from the top about every two weeks.