Randy Holmes-Farley
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My Tank Thread
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Well, other than high nitrates and phosphates I'm not sure what could have caused it. I have a log book of my parameters, I test weekly. As mentioned, my demand for ALK increased and CA dropped, but no swings, it all happened slowly.
My sps got brown tips and started losing color, some eventually experienced RTN, some did not. Since my actions of attacking the nutrients I have gotten some color back, but it's not back to normal yet.
But you don't test for heavy metals, bacterial pathogens, etc.