Welcome to MTS. I only have 6 tanks up and running, but have a 225, 135 and 2 75s waiting to be set up. I also have arraingements to pick up a 90 this weekend. Craigslist, Offer up, Let Go and your local fish clubs are the most economical ways to go. I buy heaters and air pumps from Amazon Warehouse. If they are defective, return with no hassels.