SuncrestReef
That Apex guy
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Reef Tank 365
Article Contributor
Reef Squad Emeritus
Controller Advisor
After 2 years and 9 months, I had my first failure of an optical sensor on my ATK. For those who don't know, I wrote a series of Apex tutorials here on R2R, including my ATK Tutorial which has helped hundreds of reefers to troubleshoot their ATK issues. Following my own troubleshooting instructions from that article, I identified the lower optical sensor had failed. Luckily I keep spare parts on hand and swapped out the sensor. I also took this opportunity to thoroughly clean off the ATK assembly and inspect all the components for any damage. 15 minutes later the ATK is back in business!