Here are a couple of quick pictures of what added today to the mini-hydroponic loop - a couple of aquatic frogs.
Sorry for the poor quality of the pictures - only had my phone for these ones. It is amazing how well they blend into the rocks. It will be a great conversation for my classes next week.
Wy- my question about the CO@ wasn't for this set up. I have a 25 gallon that I've added some plants to, however they aren't doing well. The leaves keep going brown to transparent to non-existent. I'm not sure what to change. The amount of fish in there should be adding enough nutrients, I'm not sure if its a CO2 issue or a lighting on. I'll try to get a picture of it next week.