Hi! I've had my aquarium for less than a month. It's a 29-gallon tank, and so far I have 4 Platies and 2 Cory Catfish. I'm planning to get some neon tetras, and I understand they like a lower pH. I added just a little pH Down from API, but now I've decided to use peat moss instead. I'm getting it from Amazon, hasn't arrived yet.