green mushrooms will not open

vultao1

New member
i have a rock the size of a closed fist that when open my green hairy mushrooms cover the whole rock but for some reason my mushrooms have not opened in about two weeks what's wrong?
 
all levels are good but my nitrate has gone up slighty i'm worried it has something to do with the sand sifting star fish i have im going to do a water change and watch my levels.my skimmer wasn't working right either so mabey insuffecient reduction of garbage.
 
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