Can someone tell me what's wrong

[Scottkutanzi]

My tank is been running for a year. The anemone was healthy looking when I bought it. I just changed out a crushed coral substrate for a sugar sand substrate. From all the forums I read everyone said the crushed coral was bad for nitrates and my nitrates were high. I'm thinking that is what killed my branching hammer and anemone


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[rsisvixen]

It depends how you did the change over of substrate, by removing it a lot of trapped stuff probably went into your water column and spiked nitrate, adding new substrate would have started a mini cycle so probably a small spike in ammonia.
So if everything was well before the change then the change of substrate is probably to blame