Hello. I am selling one of my Seneye Reef monitors. I am no longer in need of this monitor as I broke down the system that it was in. The monitor works great and will be shipped without slides. Slides need to be replaced every 30 days and cost approximately $10 each. Slides can be purchased through Seneye, your local fish store, or other retailers on the web (seneye Monitor System Accessories: Aquarium Controllers & Monitors). I find them to be cheaper when purchased locally. I have been using Seneye monitoring systems since their initial beta release. I have one running in each individual setup I own. The Reef monitor retails $199.00. I am selling my used Reef monitor for $150.00 shipped. The retail box that will be included is slightly waterlogged due to a flooding that had occurred mistakenly some time ago. Thank you for your interest.