My Rio 2100 died 3 weeks ago after 7 months of use with my skimmer. It blew a fuse totally shutting my reef down. I had tar all over my sump and when I removed it it smelled like an electrical fire. I looked in my 125 gallon tank and saw my two tangs laying on the bottom in shock and all my corals were closed. After 5 or 6 hours the tangs improved but some corals took a day or two to return to normal. Luckly nothing was lost except another Rio customer. Never again.