If you value your time don't WASTE your money on an apex. I bought a new apex Neptune and have had nothing but problems since day one and apex customer service basically treats u like you're lying about everything in an effort to not replace stuff. They won't trust me i installed the probes correctly. So you have to be by your apex Monday through Friday 9-5 est. already a pain because like most people I have a job. Then 30 minutes later the "technician" who is just a kid who goes through a printed out checklist and knows nothing about fishtanks. My salinity probe and temp probes are bad. Ok. So now I have to get them a copy of my receipt. But you register the product online when u start using it. So y do I need to send a receipt. But I do it and now they won't send me new probes until I send in the bad ones so they can diagnose them. If they determine they're bad they'll send me new ones. So what was the 30 minute phone call about? And how long am I supposed to go with out these probes?? I would not recommend this GARBAGE PRODUCT to anyone.