Plants!

Now for the fun part!

After looking through many articles on what plants to use when, I ignored all of the information and went and bought parsley and mint. I also bought strawberry, cucumber and tomato seeds. In retrospect I probably should have let the seeds germinate before planting them but we'll see how they go.

Carefully remove the plants from their pots and wash all the soil off their roots. This system doesn't use soil and it can clog up the tubes.

Make a hole deep enough to reach the water level and cover the roots of the plants. The seeds should be planted at the depth specified on the packet.

Let the plants filter out any impurities in the water before adding fish.