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thank you both for such quick responses. We perform 30-40 gal water changes about every 40 days. we just did one about 2 days ago, but the next day nitrates were high. i think something(s?) died. We performed another 30 gal water change and it lowered the nitrates, but that sand is making me...

We have a 125 gal. reef tank (about 2 yr old). Recently performed water changed and cleaned, and noticed that the sand felt dense. Also, air bubbles seemed to be coming out of the sand and there is a foul odor. I am about to perform solme water tests, but I just didn't know if this was an...