Eco Column Day 7

Today we noticed that the water in our system is still clear. Everyone else's water is either brown or green. Could this be because we have more sand and clay in our soil? Or could it be that we did not pour enough water for rain to make it decompose? We also noticed that our tad pole is laying on the bottom and appears to be dead. Was there not enough oxygen for its survival? Why are the minnows still swimming around? Today when we added water for it to rain the minnows began to swim more vigorously and the water did begin to cloud up. I also noticed the lech I had not seen before, it must have been hiding in the bottom and then when we added the water he decided to see what was going on. I can't wait to see if the water clears again or stay cloudy.