I have a small pond, never had one before, didn't realise there was so much to it! It is only small, approx 80 gallons I would say, I have some plants in it and was hoping to have fish, maybe just 1 or 2. From what I have read, a natural environment is best, but wondered if I could ask the advice of others more experienced! I believe that plants purify the water and I would only need filtration if I intend to put more fish in than the water can naturally sustain, is this correct and if so will I still need some sort of water feature for oxygenation.