Thankyou. I started in April. It’s a cold water tank with a pump and lights. I was cleaning it every 3 weeks. It was never ending! Then my daughters tank suddenly developed ‘snails’ brought in on a shop bought plant we think. They multiplied pretty quickly but she noticed how clean her tank was. I took 7 of them. And yes, my tank is so clean!! I take out a jug of water occasionally and top up and that’s it!! To me my snails are magic. 😊😊 thanks for reading.