Lack of water changes....I got back on a schedule a few months ago, but left the heater in my nsw container on, it burnt a hole in the side and I haven't bought a new one. My skimmer has been off for a week or so and sometimes I don't top up my ato, so I get salinity swings. I came home from the wedding this past weekend and my temp was at 86 in the tank. Everything is fine.
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