Agreed with everyone above, with no circulation an lack of oxygen paired with fluctuations in temperature and light deprived your rock is done. Soak in freshwater and change the water 3-4 times. You should use a few strong powerheads to circulate the freshwater and maybe even flush the crud inside the rocks. Once the water is clear you should be able to add it to your tank
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90g starphire cube/400mhRadium20k/2 XHO/2x27w UV/2x39w T5/ 3 Trulumen led strips
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