Quote:
Originally Posted by nanoreefnewbie
Its was used from mature system bought from guy with rock
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Did you wash the sand really really well? Old/used sand causes tank crashes due to the excess of nutrients it traps in it. If you didn't rinse it I would remove it all and rinse it out until the water runs clear. The sand will cause nitrate (and other) issues if not cleaned. When my boyfriend moved his tank 2 years ago he used a 1" layer of the old sand and it caused his whole tank to crash, he lost 2 rubbermaid containers full of sps, all his zoas and fish
